[APM] Return operationName as part of _inspect response (#103616)

Closes #103448.

x-pack/plugins/apm/server/lib/helpers/create_es_client/call_async_with_debug.ts

@@ -23,6 +23,7 @@ export async function callAsyncWithDebug<T>({
   request,
   requestType,
   requestParams,
+  operationName,
   isCalledWithInternalUser,
 }: {
   cb: () => Promise<T>;
@@ -31,6 +32,7 @@ export async function callAsyncWithDebug<T>({
   request: KibanaRequest;
   requestType: string;
   requestParams: Record<string, any>;
+  operationName: string;
   isCalledWithInternalUser: boolean; // only allow inspection of queries that were retrieved with credentials of the end user
 }) {
   if (!debug) {
@@ -65,6 +67,7 @@ export async function callAsyncWithDebug<T>({
     const inspectableEsQueries = inspectableEsQueriesMap.get(request);
     if (!isCalledWithInternalUser && inspectableEsQueries) {
       inspectableEsQueries.push({
+        operationName,
         response: res,
         duration,
         requestType,

x-pack/plugins/apm/server/lib/helpers/create_es_client/create_apm_event_client/index.ts

@@ -120,6 +120,7 @@ export function createApmEventClient({
         debug,
         request,
         requestType,
+        operationName,
         requestParams: searchParams,
       });
     },

x-pack/plugins/apm/server/lib/helpers/create_es_client/create_internal_es_client/index.ts

@@ -54,6 +54,7 @@ export function createInternalESClient({
       request,
       requestType,
       requestParams: params,
+      operationName,
     });
   }
 

x-pack/plugins/apm/server/routes/typings.ts

@@ -29,6 +29,7 @@ export type InspectResponse = Array<{
   requestType: string;
   requestParams: Record<string, unknown>;
   esError: Error;
+  operationName: string;
 }>;
 
 export interface APMRouteCreateOptions {

x-pack/test/apm_api_integration/tests/inspect/inspect.ts

@@ -53,6 +53,7 @@ export default function customLinksTests({ getService }: FtrProviderContext) {
 
           // @ts-expect-error
           expect(Object.keys(body._inspect[0])).to.eql([
+            'operationName',
             'response',
             'duration',
             'requestType',