Fixed Search UI route (#99065) (#99093)

x-pack/plugins/enterprise_search/server/routes/app_search/search_ui.test.ts

@@ -33,7 +33,7 @@ describe('reference application routes', () => {
       });
 
       expect(mockRequestHandler.createRequest).toHaveBeenCalledWith({
-        path: '/as/engines/:engineName/search_ui/field_config',
+        path: '/as/engines/:engineName/reference_application/field_config',
       });
     });
   });

x-pack/plugins/enterprise_search/server/routes/app_search/search_ui.ts

@@ -23,7 +23,7 @@ export function registerSearchUIRoutes({
       },
     },
     enterpriseSearchRequestHandler.createRequest({
-      path: '/as/engines/:engineName/search_ui/field_config',
+      path: '/as/engines/:engineName/reference_application/field_config',
     })
   );
 }