diff --git a/x-pack/plugins/ingest_manager/common/openapi/spec_oas3.json b/x-pack/plugins/ingest_manager/common/openapi/spec_oas3.json
index 8c9ede1fde9b..d75a914e080d 100644
--- a/x-pack/plugins/ingest_manager/common/openapi/spec_oas3.json
+++ b/x-pack/plugins/ingest_manager/common/openapi/spec_oas3.json
@@ -43,12 +43,9 @@
                     },
                     "perPage": {
                       "type": "number"
-                    },
-                    "success": {
-                      "type": "boolean"
                     }
                   },
-                  "required": ["items", "total", "page", "perPage", "success"]
+                  "required": ["items", "total", "page", "perPage"]
                 },
                 "examples": {
                   "success": {
@@ -71,8 +68,7 @@
                       ],
                       "total": 1,
                       "page": 1,
-                      "perPage": 50,
-                      "success": true
+                      "perPage": 50
                     }
                   }
                 }
@@ -107,9 +103,6 @@
                   "properties": {
                     "item": {
                       "$ref": "#/components/schemas/AgentPolicy"
-                    },
-                    "success": {
-                      "type": "boolean"
                     }
                   }
                 }
@@ -159,12 +152,9 @@
                   "properties": {
                     "item": {
                       "$ref": "#/components/schemas/AgentPolicy"
-                    },
-                    "success": {
-                      "type": "boolean"
                     }
                   },
-                  "required": ["item", "success"]
+                  "required": ["item"]
                 },
                 "examples": {
                   "success": {
@@ -707,8 +697,7 @@
                         "revision": 2,
                         "updated_on": "2020-05-06T17:32:21.905Z",
                         "updated_by": "system"
-                      },
-                      "success": true
+                      }
                     }
                   }
                 }
@@ -733,12 +722,9 @@
                   "properties": {
                     "item": {
                       "$ref": "#/components/schemas/AgentPolicy"
-                    },
-                    "success": {
-                      "type": "boolean"
                     }
                   },
-                  "required": ["item", "success"]
+                  "required": ["item"]
                 },
                 "examples": {
                   "example-1": {
@@ -751,8 +737,7 @@
                         "updated_on": "Fri Feb 28 2020 16:22:31 GMT-0500 (Eastern Standard Time)",
                         "updated_by": "elastic",
                         "packagePolicies": []
-                      },
-                      "success": true
+                      }
                     }
                   }
                 }
@@ -810,12 +795,9 @@
                   "properties": {
                     "item": {
                       "$ref": "#/components/schemas/AgentPolicy"
-                    },
-                    "success": {
-                      "type": "boolean"
                     }
                   },
-                  "required": ["item", "success"]
+                  "required": ["item"]
                 }
               }
             }
@@ -948,12 +930,9 @@
                     },
                     "perPage": {
                       "type": "number"
-                    },
-                    "success": {
-                      "type": "boolean"
                     }
                   },
-                  "required": ["items", "success"]
+                  "required": ["items"]
                 },
                 "examples": {
                   "example-1": {
@@ -1157,8 +1136,7 @@
                       ],
                       "total": 6,
                       "page": 1,
-                      "perPage": 20,
-                      "success": true
+                      "perPage": 20
                     }
                   }
                 }
@@ -1251,12 +1229,9 @@
                   "properties": {
                     "item": {
                       "$ref": "#/components/schemas/PackagePolicy"
-                    },
-                    "success": {
-                      "type": "boolean"
                     }
                   },
-                  "required": ["item", "success"]
+                  "required": ["item"]
                 }
               }
             }
@@ -1415,9 +1390,6 @@
                       "properties": {
                         "response": {
                           "$ref": "#/components/schemas/PackageInfo"
-                        },
-                        "success": {
-                          "type": "boolean"
                         }
                       }
                     },
@@ -1709,8 +1681,7 @@
                           },
                           "references": []
                         }
-                      },
-                      "success": true
+                      }
                     }
                   },
                   "required-package": {
@@ -1899,8 +1870,7 @@
                           },
                           "references": []
                         }
-                      },
-                      "success": true
+                      }
                     }
                   }
                 }
@@ -1950,12 +1920,9 @@
                         },
                         "required": ["id", "type"]
                       }
-                    },
-                    "success": {
-                      "type": "boolean"
                     }
                   },
-                  "required": ["response", "success"]
+                  "required": ["response"]
                 }
               }
             }
@@ -1994,12 +1961,9 @@
                         },
                         "required": ["id", "type"]
                       }
-                    },
-                    "success": {
-                      "type": "boolean"
                     }
                   },
-                  "required": ["response", "success"]
+                  "required": ["response"]
                 }
               }
             }
@@ -2678,8 +2642,7 @@
                           "version": "1.0.0",
                           "status": "not_installed"
                         }
-                      ],
-                      "success": true
+                      ]
                     }
                   }
                 }
@@ -2743,9 +2706,6 @@
                         "type": "object"
                       }
                     },
-                    "success": {
-                      "type": "boolean"
-                    },
                     "total": {
                       "type": "number"
                     },
@@ -2756,7 +2716,7 @@
                       "type": "number"
                     }
                   },
-                  "required": ["list", "success", "total", "page", "perPage"]
+                  "required": ["list", "total", "page", "perPage"]
                 },
                 "examples": {
                   "example-1": {
@@ -2793,7 +2753,6 @@
                           "status": "online"
                         }
                       ],
-                      "success": true,
                       "total": 1,
                       "page": 1,
                       "perPage": 20
@@ -2836,12 +2795,9 @@
                   "properties": {
                     "item": {
                       "type": "object"
-                    },
-                    "success": {
-                      "type": "string"
                     }
                   },
-                  "required": ["item", "success"]
+                  "required": ["item"]
                 }
               }
             }
@@ -2916,9 +2872,6 @@
                       "type": "string",
                       "enum": ["checkin"]
                     },
-                    "success": {
-                      "type": "string"
-                    },
                     "actions": {
                       "type": "array",
                       "items": {
@@ -2950,7 +2903,6 @@
                   "success": {
                     "value": {
                       "action": "checkin",
-                      "success": true,
                       "actions": [
                         {
                           "agent_id": "a6f14bd2-1a2a-481c-9212-9494d064ffdf",
@@ -3346,21 +3298,17 @@
                 "schema": {
                   "type": "object",
                   "properties": {
-                    "success": {
-                      "type": "boolean"
-                    },
                     "action": {
                       "type": "string",
                       "enum": ["acks"]
                     }
                   },
-                  "required": ["success", "action"]
+                  "required": ["action"]
                 },
                 "examples": {
                   "success": {
                     "value": {
-                      "action": "checkin",
-                      "success": true
+                      "action": "checkin"
                     }
                   }
                 }
@@ -3417,9 +3365,6 @@
                     "action": {
                       "type": "string"
                     },
-                    "success": {
-                      "type": "boolean"
-                    },
                     "item": {
                       "$ref": "#/components/schemas/Agent"
                     }
@@ -3429,7 +3374,6 @@
                   "success": {
                     "value": {
                       "action": "created",
-                      "success": true,
                       "item": {
                         "id": "8086fb1a-72ca-4a67-8533-09300c1639fa",
                         "active": true,
diff --git a/x-pack/plugins/ingest_manager/common/types/rest_spec/agent.ts b/x-pack/plugins/ingest_manager/common/types/rest_spec/agent.ts
index 4a50938049a7..cf8d3ab1c908 100644
--- a/x-pack/plugins/ingest_manager/common/types/rest_spec/agent.ts
+++ b/x-pack/plugins/ingest_manager/common/types/rest_spec/agent.ts
@@ -28,7 +28,6 @@ export interface GetAgentsResponse {
   total: number;
   page: number;
   perPage: number;
-  success: boolean;
 }
 
 export interface GetOneAgentRequest {
@@ -39,7 +38,6 @@ export interface GetOneAgentRequest {
 
 export interface GetOneAgentResponse {
   item: Agent;
-  success: boolean;
 }
 
 export interface PostAgentCheckinRequest {
@@ -55,7 +53,7 @@ export interface PostAgentCheckinRequest {
 
 export interface PostAgentCheckinResponse {
   action: string;
-  success: boolean;
+
   actions: AgentAction[];
 }
 
@@ -72,7 +70,7 @@ export interface PostAgentEnrollRequest {
 
 export interface PostAgentEnrollResponse {
   action: string;
-  success: boolean;
+
   item: Agent & { status: AgentStatus };
 }
 
@@ -87,7 +85,6 @@ export interface PostAgentAcksRequest {
 
 export interface PostAgentAcksResponse {
   action: string;
-  success: boolean;
 }
 
 export interface PostNewAgentActionRequest {
@@ -100,7 +97,6 @@ export interface PostNewAgentActionRequest {
 }
 
 export interface PostNewAgentActionResponse {
-  success: boolean;
   item: AgentAction;
 }
 
@@ -110,9 +106,8 @@ export interface PostAgentUnenrollRequest {
   };
 }
 
-export interface PostAgentUnenrollResponse {
-  success: boolean;
-}
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
+export interface PostAgentUnenrollResponse {}
 
 export interface PutAgentReassignRequest {
   params: {
@@ -121,9 +116,8 @@ export interface PutAgentReassignRequest {
   body: { policy_id: string };
 }
 
-export interface PutAgentReassignResponse {
-  success: boolean;
-}
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
+export interface PutAgentReassignResponse {}
 
 export interface GetOneAgentEventsRequest {
   params: {
@@ -141,7 +135,6 @@ export interface GetOneAgentEventsResponse {
   total: number;
   page: number;
   perPage: number;
-  success: boolean;
 }
 
 export interface DeleteAgentRequest {
@@ -166,7 +159,6 @@ export interface GetAgentStatusRequest {
 }
 
 export interface GetAgentStatusResponse {
-  success: boolean;
   results: {
     events: number;
     total: number;
diff --git a/x-pack/plugins/ingest_manager/common/types/rest_spec/agent_policy.ts b/x-pack/plugins/ingest_manager/common/types/rest_spec/agent_policy.ts
index 4683727ed51a..aa9fbc20fc0b 100644
--- a/x-pack/plugins/ingest_manager/common/types/rest_spec/agent_policy.ts
+++ b/x-pack/plugins/ingest_manager/common/types/rest_spec/agent_policy.ts
@@ -19,7 +19,6 @@ export interface GetAgentPoliciesResponse {
   total: number;
   page: number;
   perPage: number;
-  success: boolean;
 }
 
 export interface GetOneAgentPolicyRequest {
@@ -30,7 +29,6 @@ export interface GetOneAgentPolicyRequest {
 
 export interface GetOneAgentPolicyResponse {
   item: AgentPolicy;
-  success: boolean;
 }
 
 export interface CreateAgentPolicyRequest {
@@ -39,7 +37,6 @@ export interface CreateAgentPolicyRequest {
 
 export interface CreateAgentPolicyResponse {
   item: AgentPolicy;
-  success: boolean;
 }
 
 export type UpdateAgentPolicyRequest = GetOneAgentPolicyRequest & {
@@ -48,7 +45,6 @@ export type UpdateAgentPolicyRequest = GetOneAgentPolicyRequest & {
 
 export interface UpdateAgentPolicyResponse {
   item: AgentPolicy;
-  success: boolean;
 }
 
 export interface CopyAgentPolicyRequest {
@@ -57,7 +53,6 @@ export interface CopyAgentPolicyRequest {
 
 export interface CopyAgentPolicyResponse {
   item: AgentPolicy;
-  success: boolean;
 }
 
 export interface DeleteAgentPolicyRequest {
@@ -68,7 +63,6 @@ export interface DeleteAgentPolicyRequest {
 
 export interface DeleteAgentPolicyResponse {
   id: string;
-  success: boolean;
 }
 
 export interface GetFullAgentPolicyRequest {
@@ -79,5 +73,4 @@ export interface GetFullAgentPolicyRequest {
 
 export interface GetFullAgentPolicyResponse {
   item: FullAgentPolicy;
-  success: boolean;
 }
diff --git a/x-pack/plugins/ingest_manager/common/types/rest_spec/enrollment_api_key.ts b/x-pack/plugins/ingest_manager/common/types/rest_spec/enrollment_api_key.ts
index 1929955cac84..1d1c2f79bf6c 100644
--- a/x-pack/plugins/ingest_manager/common/types/rest_spec/enrollment_api_key.ts
+++ b/x-pack/plugins/ingest_manager/common/types/rest_spec/enrollment_api_key.ts
@@ -19,7 +19,6 @@ export interface GetEnrollmentAPIKeysResponse {
   total: number;
   page: number;
   perPage: number;
-  success: boolean;
 }
 
 export interface GetOneEnrollmentAPIKeyRequest {
@@ -30,7 +29,6 @@ export interface GetOneEnrollmentAPIKeyRequest {
 
 export interface GetOneEnrollmentAPIKeyResponse {
   item: EnrollmentAPIKey;
-  success: boolean;
 }
 
 export interface DeleteEnrollmentAPIKeyRequest {
@@ -41,7 +39,6 @@ export interface DeleteEnrollmentAPIKeyRequest {
 
 export interface DeleteEnrollmentAPIKeyResponse {
   action: string;
-  success: boolean;
 }
 
 export interface PostEnrollmentAPIKeyRequest {
@@ -55,5 +52,4 @@ export interface PostEnrollmentAPIKeyRequest {
 export interface PostEnrollmentAPIKeyResponse {
   action: string;
   item: EnrollmentAPIKey;
-  success: boolean;
 }
diff --git a/x-pack/plugins/ingest_manager/common/types/rest_spec/epm.ts b/x-pack/plugins/ingest_manager/common/types/rest_spec/epm.ts
index 1901b8c0c703..5fb718f91b87 100644
--- a/x-pack/plugins/ingest_manager/common/types/rest_spec/epm.ts
+++ b/x-pack/plugins/ingest_manager/common/types/rest_spec/epm.ts
@@ -20,7 +20,6 @@ export interface GetCategoriesRequest {
 
 export interface GetCategoriesResponse {
   response: CategorySummaryList;
-  success: boolean;
 }
 
 export interface GetPackagesRequest {
@@ -39,12 +38,10 @@ export interface GetPackagesResponse {
       >
     >
   >;
-  success: boolean;
 }
 
 export interface GetLimitedPackagesResponse {
   response: string[];
-  success: boolean;
 }
 
 export interface GetFileRequest {
@@ -62,7 +59,6 @@ export interface GetInfoRequest {
 
 export interface GetInfoResponse {
   response: PackageInfo;
-  success: boolean;
 }
 
 export interface InstallPackageRequest {
@@ -73,7 +69,6 @@ export interface InstallPackageRequest {
 
 export interface InstallPackageResponse {
   response: AssetReference[];
-  success: boolean;
 }
 
 export interface DeletePackageRequest {
@@ -84,5 +79,4 @@ export interface DeletePackageRequest {
 
 export interface DeletePackageResponse {
   response: AssetReference[];
-  success: boolean;
 }
diff --git a/x-pack/plugins/ingest_manager/common/types/rest_spec/output.ts b/x-pack/plugins/ingest_manager/common/types/rest_spec/output.ts
index 416206036338..87e8a0977e3b 100644
--- a/x-pack/plugins/ingest_manager/common/types/rest_spec/output.ts
+++ b/x-pack/plugins/ingest_manager/common/types/rest_spec/output.ts
@@ -7,7 +7,6 @@ import { Output } from '../models';
 
 export interface GetOneOutputResponse {
   item: Output;
-  success: boolean;
 }
 
 export interface GetOneOutputRequest {
@@ -28,7 +27,6 @@ export interface PutOutputRequest {
 
 export interface PutOutputResponse {
   item: Output;
-  success: boolean;
 }
 
 export interface GetOutputsResponse {
@@ -36,5 +34,4 @@ export interface GetOutputsResponse {
   total: number;
   page: number;
   perPage: number;
-  success: boolean;
 }
diff --git a/x-pack/plugins/ingest_manager/common/types/rest_spec/package_policy.ts b/x-pack/plugins/ingest_manager/common/types/rest_spec/package_policy.ts
index e5bba3d6deab..61669ab876d8 100644
--- a/x-pack/plugins/ingest_manager/common/types/rest_spec/package_policy.ts
+++ b/x-pack/plugins/ingest_manager/common/types/rest_spec/package_policy.ts
@@ -18,7 +18,6 @@ export interface GetPackagePoliciesResponse {
   total: number;
   page: number;
   perPage: number;
-  success: boolean;
 }
 
 export interface GetOnePackagePolicyRequest {
@@ -29,7 +28,6 @@ export interface GetOnePackagePolicyRequest {
 
 export interface GetOnePackagePolicyResponse {
   item: PackagePolicy;
-  success: boolean;
 }
 
 export interface CreatePackagePolicyRequest {
@@ -38,7 +36,6 @@ export interface CreatePackagePolicyRequest {
 
 export interface CreatePackagePolicyResponse {
   item: PackagePolicy;
-  success: boolean;
 }
 
 export type UpdatePackagePolicyRequest = GetOnePackagePolicyRequest & {
diff --git a/x-pack/plugins/ingest_manager/common/types/rest_spec/settings.ts b/x-pack/plugins/ingest_manager/common/types/rest_spec/settings.ts
index c02a5e5878ee..90d623b8a4be 100644
--- a/x-pack/plugins/ingest_manager/common/types/rest_spec/settings.ts
+++ b/x-pack/plugins/ingest_manager/common/types/rest_spec/settings.ts
@@ -7,7 +7,6 @@ import { Settings } from '../models';
 
 export interface GetSettingsResponse {
   item: Settings;
-  success: boolean;
 }
 
 export interface PutSettingsRequest {
@@ -16,5 +15,4 @@ export interface PutSettingsRequest {
 
 export interface PutSettingsResponse {
   item: Settings;
-  success: boolean;
 }
diff --git a/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/components/agent_policy_copy_provider.tsx b/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/components/agent_policy_copy_provider.tsx
index 8a91cabe78d0..fefbe1fa82a0 100644
--- a/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/components/agent_policy_copy_provider.tsx
+++ b/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/components/agent_policy_copy_provider.tsx
@@ -61,7 +61,7 @@ export const AgentPolicyCopyProvider: React.FunctionComponent<Props> = ({ childr
     try {
       const { data } = await sendCopyAgentPolicy(agentPolicy!.id, newAgentPolicy!);
 
-      if (data?.success) {
+      if (data) {
         notifications.toasts.addSuccess(
           i18n.translate('xpack.ingestManager.copyAgentPolicy.successNotificationTitle', {
             defaultMessage: 'Agent policy copied',
@@ -70,9 +70,7 @@ export const AgentPolicyCopyProvider: React.FunctionComponent<Props> = ({ childr
         if (onSuccessCallback.current) {
           onSuccessCallback.current(data.item);
         }
-      }
-
-      if (!data?.success) {
+      } else {
         notifications.toasts.addDanger(
           i18n.translate('xpack.ingestManager.copyAgentPolicy.failureNotificationTitle', {
             defaultMessage: "Error copying agent policy '{id}'",
diff --git a/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/components/agent_policy_delete_provider.tsx b/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/components/agent_policy_delete_provider.tsx
index 08367bf2a97b..15f71689ecdf 100644
--- a/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/components/agent_policy_delete_provider.tsx
+++ b/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/components/agent_policy_delete_provider.tsx
@@ -59,7 +59,7 @@ export const AgentPolicyDeleteProvider: React.FunctionComponent<Props> = ({ chil
         agentPolicyId: agentPolicy!,
       });
 
-      if (data?.success) {
+      if (data) {
         notifications.toasts.addSuccess(
           i18n.translate('xpack.ingestManager.deleteAgentPolicy.successSingleNotificationTitle', {
             defaultMessage: "Deleted agent policy '{id}'",
@@ -69,9 +69,7 @@ export const AgentPolicyDeleteProvider: React.FunctionComponent<Props> = ({ chil
         if (onSuccessCallback.current) {
           onSuccessCallback.current(agentPolicy!);
         }
-      }
-
-      if (!data?.success) {
+      } else {
         notifications.toasts.addDanger(
           i18n.translate('xpack.ingestManager.deleteAgentPolicy.failureSingleNotificationTitle', {
             defaultMessage: "Error deleting agent policy '{id}'",
diff --git a/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/details_page/components/settings/index.tsx b/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/details_page/components/settings/index.tsx
index 766bdc2e2c19..b8fbb4f1835a 100644
--- a/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/details_page/components/settings/index.tsx
+++ b/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/details_page/components/settings/index.tsx
@@ -82,7 +82,7 @@ export const SettingsView = memo<{ agentPolicy: AgentPolicy }>(
           namespace,
           monitoring_enabled,
         });
-        if (data?.success) {
+        if (data) {
           notifications.toasts.addSuccess(
             i18n.translate('xpack.ingestManager.editAgentPolicy.successNotificationTitle', {
               defaultMessage: "Successfully updated '{name}' settings",
diff --git a/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/list_page/components/create_agent_policy.tsx b/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/list_page/components/create_agent_policy.tsx
index b072990727e3..e3e2975777e1 100644
--- a/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/list_page/components/create_agent_policy.tsx
+++ b/x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/agent_policy/list_page/components/create_agent_policy.tsx
@@ -116,7 +116,7 @@ export const CreateAgentPolicyFlyout: React.FunctionComponent<Props> = ({
               try {
                 const { data, error } = await createAgentPolicy();
                 setIsLoading(false);
-                if (data?.success) {
+                if (data) {
                   notifications.toasts.addSuccess(
                     i18n.translate(
                       'xpack.ingestManager.createAgentPolicy.successNotificationTitle',
diff --git a/x-pack/plugins/ingest_manager/scripts/dev_agent/script.ts b/x-pack/plugins/ingest_manager/scripts/dev_agent/script.ts
index c7b8edd0c332..65375a076e9a 100644
--- a/x-pack/plugins/ingest_manager/scripts/dev_agent/script.ts
+++ b/x-pack/plugins/ingest_manager/scripts/dev_agent/script.ts
@@ -122,7 +122,7 @@ async function enroll(kibanaURL: string, apiKey: string, log: ToolingLog): Promi
   });
   const obj: PostAgentEnrollResponse = await res.json();
 
-  if (!obj.success) {
+  if (!res.ok) {
     log.error(JSON.stringify(obj, null, 2));
     throw new Error('unable to enroll');
   }
diff --git a/x-pack/plugins/ingest_manager/server/routes/agent/acks_handlers.test.ts b/x-pack/plugins/ingest_manager/server/routes/agent/acks_handlers.test.ts
index aaed189ae3dd..33b9dc617075 100644
--- a/x-pack/plugins/ingest_manager/server/routes/agent/acks_handlers.test.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/agent/acks_handlers.test.ts
@@ -88,7 +88,6 @@ describe('test acks handlers', () => {
     await postAgentAcksHandler(({} as unknown) as RequestHandlerContext, mockRequest, mockResponse);
     expect(mockResponse.ok.mock.calls[0][0]?.body as PostAgentAcksResponse).toEqual({
       action: 'acks',
-      success: true,
     });
   });
 });
diff --git a/x-pack/plugins/ingest_manager/server/routes/agent/acks_handlers.ts b/x-pack/plugins/ingest_manager/server/routes/agent/acks_handlers.ts
index 0b719d8a67df..564f5d03e945 100644
--- a/x-pack/plugins/ingest_manager/server/routes/agent/acks_handlers.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/agent/acks_handlers.ts
@@ -46,7 +46,6 @@ export const postAgentAcksHandlerBuilder = function (
 
       const body: PostAgentAcksResponse = {
         action: 'acks',
-        success: true,
       };
 
       return response.ok({ body });
diff --git a/x-pack/plugins/ingest_manager/server/routes/agent/actions_handlers.test.ts b/x-pack/plugins/ingest_manager/server/routes/agent/actions_handlers.test.ts
index bcb9a7797f26..5445a46fbe2b 100644
--- a/x-pack/plugins/ingest_manager/server/routes/agent/actions_handlers.test.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/agent/actions_handlers.test.ts
@@ -97,6 +97,5 @@ describe('test actions handlers', () => {
       ?.body as unknown) as PostNewAgentActionResponse;
 
     expect(expectedAgentActionResponse.item).toEqual(agentAction);
-    expect(expectedAgentActionResponse.success).toEqual(true);
   });
 });
diff --git a/x-pack/plugins/ingest_manager/server/routes/agent/actions_handlers.ts b/x-pack/plugins/ingest_manager/server/routes/agent/actions_handlers.ts
index 81893b1e7833..b81d44c40f8e 100644
--- a/x-pack/plugins/ingest_manager/server/routes/agent/actions_handlers.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/agent/actions_handlers.ts
@@ -35,7 +35,6 @@ export const postNewAgentActionHandlerBuilder = function (
       });
 
       const body: PostNewAgentActionResponse = {
-        success: true,
         item: savedAgentAction,
       };
 
diff --git a/x-pack/plugins/ingest_manager/server/routes/agent/handlers.ts b/x-pack/plugins/ingest_manager/server/routes/agent/handlers.ts
index 3e80a74dc2b1..2bce8daa6637 100644
--- a/x-pack/plugins/ingest_manager/server/routes/agent/handlers.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/agent/handlers.ts
@@ -43,7 +43,6 @@ export const getAgentHandler: RequestHandler<TypeOf<
         ...agent,
         status: AgentService.getAgentStatus(agent),
       },
-      success: true,
     };
 
     return response.ok({ body });
@@ -77,7 +76,6 @@ export const getAgentEventsHandler: RequestHandler<
     const body: GetOneAgentEventsResponse = {
       list: items,
       total,
-      success: true,
       page,
       perPage,
     };
@@ -107,7 +105,6 @@ export const deleteAgentHandler: RequestHandler<TypeOf<
     await AgentService.deleteAgent(soClient, request.params.agentId);
 
     const body = {
-      success: true,
       action: 'deleted',
     };
 
@@ -144,7 +141,6 @@ export const updateAgentHandler: RequestHandler<
         ...agent,
         status: AgentService.getAgentStatus(agent),
       },
-      success: true,
     };
 
     return response.ok({ body });
@@ -187,7 +183,6 @@ export const postAgentCheckinHandler: RequestHandler<
     );
     const body: PostAgentCheckinResponse = {
       action: 'checkin',
-      success: true,
       actions: actions.map((a) => ({
         agent_id: agent.id,
         type: a.type,
@@ -248,7 +243,6 @@ export const postAgentEnrollHandler: RequestHandler<
     );
     const body: PostAgentEnrollResponse = {
       action: 'created',
-      success: true,
       item: {
         ...agent,
         status: AgentService.getAgentStatus(agent),
@@ -289,7 +283,6 @@ export const getAgentsHandler: RequestHandler<
         ...agent,
         status: AgentService.getAgentStatus(agent),
       })),
-      success: true,
       total,
       page,
       perPage,
@@ -312,9 +305,7 @@ export const putAgentsReassignHandler: RequestHandler<
   try {
     await AgentService.reassignAgent(soClient, request.params.agentId, request.body.policy_id);
 
-    const body: PutAgentReassignResponse = {
-      success: true,
-    };
+    const body: PutAgentReassignResponse = {};
     return response.ok({ body });
   } catch (e) {
     return response.customError({
@@ -336,7 +327,7 @@ export const getAgentStatusForAgentPolicyHandler: RequestHandler<
       request.query.policyId
     );
 
-    const body: GetAgentStatusResponse = { results, success: true };
+    const body: GetAgentStatusResponse = { results };
 
     return response.ok({ body });
   } catch (e) {
diff --git a/x-pack/plugins/ingest_manager/server/routes/agent/unenroll_handler.ts b/x-pack/plugins/ingest_manager/server/routes/agent/unenroll_handler.ts
index d1e54fe4fb3a..5df695d248f5 100644
--- a/x-pack/plugins/ingest_manager/server/routes/agent/unenroll_handler.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/agent/unenroll_handler.ts
@@ -23,9 +23,7 @@ export const postAgentsUnenrollHandler: RequestHandler<
       await AgentService.unenrollAgent(soClient, request.params.agentId);
     }
 
-    const body: PostAgentUnenrollResponse = {
-      success: true,
-    };
+    const body: PostAgentUnenrollResponse = {};
     return response.ok({ body });
   } catch (e) {
     return response.customError({
diff --git a/x-pack/plugins/ingest_manager/server/routes/agent_policy/handlers.ts b/x-pack/plugins/ingest_manager/server/routes/agent_policy/handlers.ts
index cc178e1038e2..7eb3df234610 100644
--- a/x-pack/plugins/ingest_manager/server/routes/agent_policy/handlers.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/agent_policy/handlers.ts
@@ -49,7 +49,6 @@ export const getAgentPoliciesHandler: RequestHandler<
       total,
       page,
       perPage,
-      success: true,
     };
 
     await bluebird.map(
@@ -82,7 +81,6 @@ export const getOneAgentPolicyHandler: RequestHandler<TypeOf<
     if (agentPolicy) {
       const body: GetOneAgentPolicyResponse = {
         item: agentPolicy,
-        success: true,
       };
       return response.ok({
         body,
@@ -141,7 +139,6 @@ export const createAgentPolicyHandler: RequestHandler<
 
     const body: CreateAgentPolicyResponse = {
       item: agentPolicy,
-      success: true,
     };
 
     return response.ok({
@@ -171,7 +168,7 @@ export const updateAgentPolicyHandler: RequestHandler<
         user: user || undefined,
       }
     );
-    const body: UpdateAgentPolicyResponse = { item: agentPolicy, success: true };
+    const body: UpdateAgentPolicyResponse = { item: agentPolicy };
     return response.ok({
       body,
     });
@@ -199,7 +196,7 @@ export const copyAgentPolicyHandler: RequestHandler<
         user: user || undefined,
       }
     );
-    const body: CopyAgentPolicyResponse = { item: agentPolicy, success: true };
+    const body: CopyAgentPolicyResponse = { item: agentPolicy };
     return response.ok({
       body,
     });
@@ -248,7 +245,6 @@ export const getFullAgentPolicy: RequestHandler<
     if (fullAgentPolicy) {
       const body: GetFullAgentPolicyResponse = {
         item: fullAgentPolicy,
-        success: true,
       };
       return response.ok({
         body,
diff --git a/x-pack/plugins/ingest_manager/server/routes/enrollment_api_key/handler.ts b/x-pack/plugins/ingest_manager/server/routes/enrollment_api_key/handler.ts
index 2d6e2f67225e..7c04acf4798f 100644
--- a/x-pack/plugins/ingest_manager/server/routes/enrollment_api_key/handler.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/enrollment_api_key/handler.ts
@@ -31,7 +31,7 @@ export const getEnrollmentApiKeysHandler: RequestHandler<
       perPage: request.query.perPage,
       kuery: request.query.kuery,
     });
-    const body: GetEnrollmentAPIKeysResponse = { list: items, success: true, total, page, perPage };
+    const body: GetEnrollmentAPIKeysResponse = { list: items, total, page, perPage };
 
     return response.ok({ body });
   } catch (e) {
@@ -54,7 +54,7 @@ export const postEnrollmentApiKeyHandler: RequestHandler<
       agentPolicyId: request.body.policy_id,
     });
 
-    const body: PostEnrollmentAPIKeyResponse = { item: apiKey, success: true, action: 'created' };
+    const body: PostEnrollmentAPIKeyResponse = { item: apiKey, action: 'created' };
 
     return response.ok({ body });
   } catch (e) {
@@ -78,7 +78,7 @@ export const deleteEnrollmentApiKeyHandler: RequestHandler<TypeOf<
   try {
     await APIKeyService.deleteEnrollmentApiKey(soClient, request.params.keyId);
 
-    const body: DeleteEnrollmentAPIKeyResponse = { action: 'deleted', success: true };
+    const body: DeleteEnrollmentAPIKeyResponse = { action: 'deleted' };
 
     return response.ok({ body });
   } catch (e) {
@@ -100,7 +100,7 @@ export const getOneEnrollmentApiKeyHandler: RequestHandler<TypeOf<
   const soClient = context.core.savedObjects.client;
   try {
     const apiKey = await APIKeyService.getEnrollmentAPIKey(soClient, request.params.keyId);
-    const body: GetOneEnrollmentAPIKeyResponse = { item: apiKey, success: true };
+    const body: GetOneEnrollmentAPIKeyResponse = { item: apiKey };
 
     return response.ok({ body });
   } catch (e) {
diff --git a/x-pack/plugins/ingest_manager/server/routes/epm/handlers.ts b/x-pack/plugins/ingest_manager/server/routes/epm/handlers.ts
index bbd91b97a86c..6400d6e215f9 100644
--- a/x-pack/plugins/ingest_manager/server/routes/epm/handlers.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/epm/handlers.ts
@@ -43,7 +43,6 @@ export const getCategoriesHandler: RequestHandler<
     const res = await getCategories(request.query);
     const body: GetCategoriesResponse = {
       response: res,
-      success: true,
     };
     return response.ok({ body });
   } catch (e) {
@@ -66,7 +65,6 @@ export const getListHandler: RequestHandler<
     });
     const body: GetPackagesResponse = {
       response: res,
-      success: true,
     };
     return response.ok({
       body,
@@ -85,7 +83,6 @@ export const getLimitedListHandler: RequestHandler = async (context, request, re
     const res = await getLimitedPackages({ savedObjectsClient });
     const body: GetLimitedPackagesResponse = {
       response: res,
-      success: true,
     };
     return response.ok({
       body,
@@ -136,7 +133,6 @@ export const getInfoHandler: RequestHandler<TypeOf<typeof GetInfoRequestSchema.p
     const res = await getPackageInfo({ savedObjectsClient, pkgName, pkgVersion });
     const body: GetInfoResponse = {
       response: res,
-      success: true,
     };
     return response.ok({ body });
   } catch (e) {
@@ -166,7 +162,6 @@ export const installPackageHandler: RequestHandler<
     });
     const body: InstallPackageResponse = {
       response: res,
-      success: true,
     };
     return response.ok({ body });
   } catch (e) {
@@ -206,7 +201,6 @@ export const deletePackageHandler: RequestHandler<TypeOf<
     const res = await removeInstallation({ savedObjectsClient, pkgkey, callCluster });
     const body: DeletePackageResponse = {
       response: res,
-      success: true,
     };
     return response.ok({ body });
   } catch (e) {
diff --git a/x-pack/plugins/ingest_manager/server/routes/output/handler.ts b/x-pack/plugins/ingest_manager/server/routes/output/handler.ts
index cd35b2a43426..d920ad4e6cb7 100644
--- a/x-pack/plugins/ingest_manager/server/routes/output/handler.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/output/handler.ts
@@ -20,7 +20,6 @@ export const getOutputsHandler: RequestHandler = async (context, request, respon
       page: outputs.page,
       perPage: outputs.perPage,
       total: outputs.total,
-      success: true,
     };
 
     return response.ok({ body });
@@ -41,7 +40,6 @@ export const getOneOuputHandler: RequestHandler<TypeOf<
 
     const body: GetOneOutputResponse = {
       item: output,
-      success: true,
     };
 
     return response.ok({ body });
@@ -71,7 +69,6 @@ export const putOuputHandler: RequestHandler<
 
     const body: GetOneOutputResponse = {
       item: output,
-      success: true,
     };
 
     return response.ok({ body });
diff --git a/x-pack/plugins/ingest_manager/server/routes/package_policy/handlers.ts b/x-pack/plugins/ingest_manager/server/routes/package_policy/handlers.ts
index d19a73604b4f..04e3c453da94 100644
--- a/x-pack/plugins/ingest_manager/server/routes/package_policy/handlers.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/package_policy/handlers.ts
@@ -34,7 +34,6 @@ export const getPackagePoliciesHandler: RequestHandler<
         total,
         page,
         perPage,
-        success: true,
       },
     });
   } catch (e) {
@@ -59,7 +58,6 @@ export const getOnePackagePolicyHandler: RequestHandler<TypeOf<
       return response.ok({
         body: {
           item: packagePolicy,
-          success: true,
         },
       });
     } else {
@@ -115,7 +113,7 @@ export const createPackagePolicyHandler: RequestHandler<
     const packagePolicy = await packagePolicyService.create(soClient, callCluster, newData, {
       user,
     });
-    const body: CreatePackagePolicyResponse = { item: packagePolicy, success: true };
+    const body: CreatePackagePolicyResponse = { item: packagePolicy };
     return response.ok({
       body,
     });
@@ -163,7 +161,7 @@ export const updatePackagePolicyHandler: RequestHandler<
       { user }
     );
     return response.ok({
-      body: { item: updatedPackagePolicy, success: true },
+      body: { item: updatedPackagePolicy },
     });
   } catch (e) {
     return response.customError({
diff --git a/x-pack/plugins/ingest_manager/server/routes/settings/index.ts b/x-pack/plugins/ingest_manager/server/routes/settings/index.ts
index aabb85dadabc..dcba42af6d78 100644
--- a/x-pack/plugins/ingest_manager/server/routes/settings/index.ts
+++ b/x-pack/plugins/ingest_manager/server/routes/settings/index.ts
@@ -16,7 +16,6 @@ export const getSettingsHandler: RequestHandler = async (context, request, respo
   try {
     const settings = await settingsService.getSettings(soClient);
     const body = {
-      success: true,
       item: settings,
     };
     return response.ok({ body });
@@ -47,7 +46,6 @@ export const putSettingsHandler: RequestHandler<
       user: user || undefined,
     });
     const body = {
-      success: true,
       item: settings,
     };
     return response.ok({ body });
diff --git a/x-pack/plugins/ingest_manager/server/services/agent_policy.ts b/x-pack/plugins/ingest_manager/server/services/agent_policy.ts
index 2c97bba0cac4..a03a3b7f59fb 100644
--- a/x-pack/plugins/ingest_manager/server/services/agent_policy.ts
+++ b/x-pack/plugins/ingest_manager/server/services/agent_policy.ts
@@ -380,7 +380,6 @@ class AgentPolicyService {
     await this.triggerAgentPolicyUpdatedEvent(soClient, 'deleted', id);
     return {
       id,
-      success: true,
     };
   }
 
diff --git a/x-pack/plugins/security_solution/public/management/pages/endpoint_hosts/store/mock_endpoint_result_list.ts b/x-pack/plugins/security_solution/public/management/pages/endpoint_hosts/store/mock_endpoint_result_list.ts
index aa9bef7bb541..cfde474c6290 100644
--- a/x-pack/plugins/security_solution/public/management/pages/endpoint_hosts/store/mock_endpoint_result_list.ts
+++ b/x-pack/plugins/security_solution/public/management/pages/endpoint_hosts/store/mock_endpoint_result_list.ts
@@ -90,7 +90,6 @@ const endpointListApiPathHandlerMocks = ({
     [INGEST_API_EPM_PACKAGES]: (): GetPackagesResponse => {
       return {
         response: epmPackages,
-        success: true,
       };
     },
 
@@ -114,7 +113,6 @@ const endpointListApiPathHandlerMocks = ({
       return {
         items: [agentPolicy],
         total: 10,
-        success: true,
         perPage: 10,
         page: 1,
       };
@@ -132,7 +130,6 @@ const endpointListApiPathHandlerMocks = ({
         page: 1,
         perPage: 10,
         total: endpointPackagePolicies?.length,
-        success: true,
       };
     },
   };
diff --git a/x-pack/plugins/security_solution/public/management/pages/policy/store/policy_list/test_mock_utils.ts b/x-pack/plugins/security_solution/public/management/pages/policy/store/policy_list/test_mock_utils.ts
index 5ef01c00dbf1..1093aed0608d 100644
--- a/x-pack/plugins/security_solution/public/management/pages/policy/store/policy_list/test_mock_utils.ts
+++ b/x-pack/plugins/security_solution/public/management/pages/policy/store/policy_list/test_mock_utils.ts
@@ -64,7 +64,6 @@ export const mockPolicyResultList: (options?: {
     total,
     page: requestPageIndex,
     perPage: requestPageSize,
-    success: true,
   };
   return mock;
 };
@@ -81,7 +80,6 @@ export const policyListApiPathHandlers = (totalPolicies: number = 1) => {
     [INGEST_API_EPM_PACKAGES]: (): GetPackagesResponse => {
       return {
         response: [generator.generateEpmPackage()],
-        success: true,
       };
     },
   };
diff --git a/x-pack/test/ingest_manager_api_integration/apis/agent_policy/agent_policy.ts b/x-pack/test/ingest_manager_api_integration/apis/agent_policy/agent_policy.ts
index b55da0798c5f..410b0fe09300 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/agent_policy/agent_policy.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/agent_policy/agent_policy.ts
@@ -14,7 +14,7 @@ export default function ({ getService }: FtrProviderContext) {
   describe('ingest_manager_agent_policies', () => {
     describe('POST /api/ingest_manager/agent_policies', () => {
       it('should work with valid values', async () => {
-        const { body: apiResponse } = await supertest
+        await supertest
           .post(`/api/ingest_manager/agent_policies`)
           .set('kbn-xsrf', 'xxxx')
           .send({
@@ -22,8 +22,6 @@ export default function ({ getService }: FtrProviderContext) {
             namespace: 'default',
           })
           .expect(200);
-
-        expect(apiResponse.success).to.be(true);
       });
 
       it('should return a 400 with an empty namespace', async () => {
@@ -61,7 +59,7 @@ export default function ({ getService }: FtrProviderContext) {
 
       it('should work with valid values', async () => {
         const {
-          body: { success, item },
+          body: { item },
         } = await supertest
           .post(`/api/ingest_manager/agent_policies/${TEST_POLICY_ID}/copy`)
           .set('kbn-xsrf', 'xxxx')
@@ -73,7 +71,6 @@ export default function ({ getService }: FtrProviderContext) {
         // eslint-disable-next-line @typescript-eslint/naming-convention
         const { id, updated_at, ...newPolicy } = item;
 
-        expect(success).to.be(true);
         expect(newPolicy).to.eql({
           name: 'Copied policy',
           description: 'Test',
diff --git a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/acks.ts b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/acks.ts
index c9fa80c88762..1613ca9d11ee 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/acks.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/acks.ts
@@ -90,7 +90,6 @@ export default function (providerContext: FtrProviderContext) {
         })
         .expect(200);
       expect(apiResponse.action).to.be('acks');
-      expect(apiResponse.success).to.be(true);
       const { body: eventResponse } = await supertest
         .get(`/api/ingest_manager/fleet/agents/agent1/events`)
         .set('kbn-xsrf', 'xx')
diff --git a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/actions.ts b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/actions.ts
index 8dc4e5c232b8..2b4bb335dfc5 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/actions.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/actions.ts
@@ -33,7 +33,6 @@ export default function (providerContext: FtrProviderContext) {
         })
         .expect(200);
 
-      expect(apiResponse.success).to.be(true);
       expect(apiResponse.item.data).to.eql({ data: 'action_data' });
       expect(apiResponse.item.sent_at).to.be('2020-03-18T19:45:02.620Z');
     });
diff --git a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/checkin.ts b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/checkin.ts
index 79f6cfae175e..fbfc94a0840b 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/checkin.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/checkin.ts
@@ -102,7 +102,6 @@ export default function (providerContext: FtrProviderContext) {
         .expect(200);
 
       expect(apiResponse.action).to.be('checkin');
-      expect(apiResponse.success).to.be(true);
     });
   });
 }
diff --git a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/complete_flow.ts b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/complete_flow.ts
index 2d14a7a10e66..1d5b682d71c7 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/complete_flow.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/complete_flow.ts
@@ -62,7 +62,6 @@ export default function (providerContext: FtrProviderContext) {
           },
         })
         .expect(200);
-      expect(enrollmentResponse.success).to.eql(true);
 
       const agentAccessAPIKey = enrollmentResponse.item.access_api_key;
 
@@ -76,14 +75,13 @@ export default function (providerContext: FtrProviderContext) {
         })
         .expect(200);
 
-      expect(checkinApiResponse.success).to.eql(true);
       expect(checkinApiResponse.actions).length(1);
       expect(checkinApiResponse.actions[0].type).be('CONFIG_CHANGE');
       const policyChangeAction = checkinApiResponse.actions[0];
       const defaultOutputApiKey = policyChangeAction.data.config.outputs.default.api_key;
 
       // Ack actions
-      const { body: ackApiResponse } = await supertestWithoutAuth
+      await supertestWithoutAuth
         .post(`/api/ingest_manager/fleet/agents/${enrollmentResponse.item.id}/acks`)
         .set('Authorization', `ApiKey ${agentAccessAPIKey}`)
         .set('kbn-xsrf', 'xx')
@@ -102,7 +100,6 @@ export default function (providerContext: FtrProviderContext) {
           ],
         })
         .expect(200);
-      expect(ackApiResponse.success).to.eql(true);
 
       // Second agent checkin
       const { body: secondCheckinApiResponse } = await supertestWithoutAuth
@@ -113,7 +110,6 @@ export default function (providerContext: FtrProviderContext) {
           events: [],
         })
         .expect(200);
-      expect(secondCheckinApiResponse.success).to.eql(true);
       expect(secondCheckinApiResponse.actions).length(0);
 
       // Get agent
@@ -121,18 +117,16 @@ export default function (providerContext: FtrProviderContext) {
         .get(`/api/ingest_manager/fleet/agents/${enrollmentResponse.item.id}`)
         .expect(200);
 
-      expect(getAgentApiResponse.success).to.eql(true);
       expect(getAgentApiResponse.item.packages).to.contain(
         'system',
         "Agent should run the 'system' package"
       );
 
       // Unenroll agent
-      const { body: unenrollResponse } = await supertest
+      await supertest
         .post(`/api/ingest_manager/fleet/agents/${enrollmentResponse.item.id}/unenroll`)
         .set('kbn-xsrf', 'xx')
         .expect(200);
-      expect(unenrollResponse.success).to.eql(true);
 
       //  Checkin after unenrollment
       const { body: checkinAfterUnenrollResponse } = await supertestWithoutAuth
@@ -144,13 +138,12 @@ export default function (providerContext: FtrProviderContext) {
         })
         .expect(200);
 
-      expect(checkinAfterUnenrollResponse.success).to.eql(true);
       expect(checkinAfterUnenrollResponse.actions).length(1);
       expect(checkinAfterUnenrollResponse.actions[0].type).be('UNENROLL');
       const unenrollAction = checkinAfterUnenrollResponse.actions[0];
 
       //  ack unenroll actions
-      const { body: ackUnenrollApiResponse } = await supertestWithoutAuth
+      await supertestWithoutAuth
         .post(`/api/ingest_manager/fleet/agents/${enrollmentResponse.item.id}/acks`)
         .set('Authorization', `ApiKey ${agentAccessAPIKey}`)
         .set('kbn-xsrf', 'xx')
@@ -168,7 +161,6 @@ export default function (providerContext: FtrProviderContext) {
           ],
         })
         .expect(200);
-      expect(ackUnenrollApiResponse.success).to.eql(true);
 
       // Checkin after unenrollment acknowledged
       await supertestWithoutAuth
diff --git a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/delete.ts b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/delete.ts
index dc05b7a4dd79..65fbdabe8bd7 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/delete.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/delete.ts
@@ -68,7 +68,6 @@ export default function ({ getService }: FtrProviderContext) {
         .expect(404);
 
       expect(apiResponse).not.to.eql({
-        success: true,
         action: 'deleted',
       });
     });
@@ -88,7 +87,6 @@ export default function ({ getService }: FtrProviderContext) {
         .set('kbn-xsrf', 'xx')
         .expect(200);
       expect(apiResponse).to.eql({
-        success: true,
         action: 'deleted',
       });
     });
diff --git a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/enroll.ts b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/enroll.ts
index 93f656ea952d..eef0d3beb69d 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/enroll.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/enroll.ts
@@ -136,7 +136,6 @@ export default function (providerContext: FtrProviderContext) {
           },
         })
         .expect(200);
-      expect(apiResponse.success).to.eql(true);
       expect(apiResponse.item).to.have.keys('id', 'active', 'access_api_key', 'type', 'policy_id');
     });
 
@@ -158,7 +157,7 @@ export default function (providerContext: FtrProviderContext) {
           },
         })
         .expect(200);
-      expect(apiResponse.success).to.eql(true);
+
       const { body: privileges } = await getEsClientForAPIKey(
         providerContext,
         apiResponse.item.access_api_key
diff --git a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/list.ts b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/list.ts
index 23563c6f43bb..1ee00ed72016 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/list.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/list.ts
@@ -78,8 +78,7 @@ export default function ({ getService }: FtrProviderContext) {
         .auth(users.fleet_admin.username, users.fleet_admin.password)
         .expect(200);
 
-      expect(apiResponse).to.have.keys('success', 'page', 'total', 'list');
-      expect(apiResponse.success).to.eql(true);
+      expect(apiResponse).to.have.keys('page', 'total', 'list');
       expect(apiResponse.total).to.eql(4);
     });
     it('should return the list of agents when requesting as a user with fleet read permissions', async () => {
@@ -87,8 +86,7 @@ export default function ({ getService }: FtrProviderContext) {
         .get(`/api/ingest_manager/fleet/agents`)
         .auth(users.fleet_user.username, users.fleet_user.password)
         .expect(200);
-      expect(apiResponse).to.have.keys('success', 'page', 'total', 'list');
-      expect(apiResponse.success).to.eql(true);
+      expect(apiResponse).to.have.keys('page', 'total', 'list');
       expect(apiResponse.total).to.eql(4);
     });
     it('should not return the list of agents when requesting as a user without fleet permissions', async () => {
diff --git a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/unenroll.ts b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/unenroll.ts
index d1ff8731183b..d24e438fa13e 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/unenroll.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/fleet/agents/unenroll.ts
@@ -65,20 +65,17 @@ export default function (providerContext: FtrProviderContext) {
     });
 
     it('allow to unenroll using a list of ids', async () => {
-      const { body } = await supertest
+      await supertest
         .post(`/api/ingest_manager/fleet/agents/agent1/unenroll`)
         .set('kbn-xsrf', 'xxx')
         .send({
           force: true,
         })
         .expect(200);
-
-      expect(body).to.have.keys('success');
-      expect(body.success).to.be(true);
     });
 
     it('should invalidate related API keys', async () => {
-      const { body } = await supertest
+      await supertest
         .post(`/api/ingest_manager/fleet/agents/agent1/unenroll`)
         .set('kbn-xsrf', 'xxx')
         .send({
@@ -86,9 +83,6 @@ export default function (providerContext: FtrProviderContext) {
         })
         .expect(200);
 
-      expect(body).to.have.keys('success');
-      expect(body.success).to.be(true);
-
       const {
         body: { api_keys: accessAPIKeys },
       } = await esClient.security.getApiKey({ id: accessAPIKeyId });
diff --git a/x-pack/test/ingest_manager_api_integration/apis/fleet/enrollment_api_keys/crud.ts b/x-pack/test/ingest_manager_api_integration/apis/fleet/enrollment_api_keys/crud.ts
index 275462072919..6c5d552a51eb 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/fleet/enrollment_api_keys/crud.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/fleet/enrollment_api_keys/crud.ts
@@ -67,13 +67,11 @@ export default function (providerContext: FtrProviderContext) {
       });
 
       it('should invalide an existing api keys', async () => {
-        const { body: apiResponse } = await supertest
+        await supertest
           .delete(`/api/ingest_manager/fleet/enrollment-api-keys/${keyId}`)
           .set('kbn-xsrf', 'xxx')
           .expect(200);
 
-        expect(apiResponse.success).to.eql(true);
-
         const {
           body: { api_keys: apiKeys },
         } = await es.security.getApiKey({ id: esApiKeyId });
@@ -113,7 +111,6 @@ export default function (providerContext: FtrProviderContext) {
           })
           .expect(200);
 
-        expect(apiResponse.success).to.eql(true);
         expect(apiResponse.item).to.have.keys('id', 'api_key', 'api_key_id', 'name', 'policy_id');
       });
 
@@ -125,7 +122,7 @@ export default function (providerContext: FtrProviderContext) {
             policy_id: 'policy1',
           })
           .expect(200);
-        expect(apiResponse.success).to.eql(true);
+
         const { body: privileges } = await getEsClientForAPIKey(
           providerContext,
           apiResponse.item.api_key
diff --git a/x-pack/test/ingest_manager_api_integration/apis/package_policy/create.ts b/x-pack/test/ingest_manager_api_integration/apis/package_policy/create.ts
index c88f03de5961..113fbeca494d 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/package_policy/create.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/package_policy/create.ts
@@ -4,7 +4,6 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import expect from '@kbn/expect';
 import { FtrProviderContext } from '../../../api_integration/ftr_provider_context';
 import { warnAndSkipTest } from '../../helpers';
 
@@ -34,7 +33,7 @@ export default function ({ getService }: FtrProviderContext) {
 
     it('should work with valid values', async function () {
       if (server.enabled) {
-        const { body: apiResponse } = await supertest
+        await supertest
           .post(`/api/ingest_manager/package_policies`)
           .set('kbn-xsrf', 'xxxx')
           .send({
@@ -52,8 +51,6 @@ export default function ({ getService }: FtrProviderContext) {
             },
           })
           .expect(200);
-
-        expect(apiResponse.success).to.be(true);
       } else {
         warnAndSkipTest(this, log);
       }
diff --git a/x-pack/test/ingest_manager_api_integration/apis/package_policy/get.ts b/x-pack/test/ingest_manager_api_integration/apis/package_policy/get.ts
index 756eaa8ea49b..53a400d2fd9e 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/package_policy/get.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/package_policy/get.ts
@@ -4,7 +4,6 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import expect from '@kbn/expect';
 import { FtrProviderContext } from '../../../api_integration/ftr_provider_context';
 import { skipIfNoDockerRegistry } from '../../helpers';
 
@@ -75,11 +74,7 @@ export default function (providerContext: FtrProviderContext) {
     });
 
     it('should succeed with a valid id', async function () {
-      const { body: apiResponse } = await supertest
-        .get(`/api/ingest_manager/package_policies/${packagePolicyId}`)
-        .expect(200);
-
-      expect(apiResponse.success).to.be(true);
+      await supertest.get(`/api/ingest_manager/package_policies/${packagePolicyId}`).expect(200);
     });
 
     it('should return a 404 with an invalid id', async function () {
diff --git a/x-pack/test/ingest_manager_api_integration/apis/package_policy/update.ts b/x-pack/test/ingest_manager_api_integration/apis/package_policy/update.ts
index e74d88f3538e..3c4cb93ee3ff 100644
--- a/x-pack/test/ingest_manager_api_integration/apis/package_policy/update.ts
+++ b/x-pack/test/ingest_manager_api_integration/apis/package_policy/update.ts
@@ -4,7 +4,6 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import expect from '@kbn/expect';
 import { FtrProviderContext } from '../../../api_integration/ftr_provider_context';
 import { skipIfNoDockerRegistry } from '../../helpers';
 
@@ -77,7 +76,7 @@ export default function (providerContext: FtrProviderContext) {
     });
 
     it('should work with valid values', async function () {
-      const { body: apiResponse } = await supertest
+      await supertest
         .put(`/api/ingest_manager/package_policies/${packagePolicyId}`)
         .set('kbn-xsrf', 'xxxx')
         .send({
@@ -95,8 +94,6 @@ export default function (providerContext: FtrProviderContext) {
           },
         })
         .expect(200);
-
-      expect(apiResponse.success).to.be(true);
     });
 
     it('should return a 500 if there is another package policy with the same name', async function () {
diff --git a/x-pack/test/security_solution_endpoint_api_int/apis/artifacts/index.ts b/x-pack/test/security_solution_endpoint_api_int/apis/artifacts/index.ts
index d5106f554992..17a4182fe937 100644
--- a/x-pack/test/security_solution_endpoint_api_int/apis/artifacts/index.ts
+++ b/x-pack/test/security_solution_endpoint_api_int/apis/artifacts/index.ts
@@ -54,7 +54,6 @@ export default function (providerContext: FtrProviderContext) {
           },
         })
         .expect(200);
-      expect(enrollmentResponse.success).to.eql(true);
 
       agentAccessAPIKey = enrollmentResponse.item.access_api_key;
     });