diff --git a/x-pack/legacy/plugins/security/index.js b/x-pack/legacy/plugins/security/index.js
index 1d798a4a2bc400..115dd8b9b8206b 100644
--- a/x-pack/legacy/plugins/security/index.js
+++ b/x-pack/legacy/plugins/security/index.js
@@ -132,7 +132,6 @@ export const security = (kibana) => new kibana.Plugin({
         server.plugins.kibana.systemApi
       ),
       cspRules: createCSPRuleString(config.get('csp.rules')),
-      kibanaIndexName: config.get('kibana.index'),
     });
 
     // Legacy xPack Info endpoint returns whatever we return in a callback for `registerLicenseCheckResultsGenerator`
diff --git a/x-pack/plugins/security/server/authorization/check_privileges.test.ts b/x-pack/plugins/security/server/authorization/check_privileges.test.ts
index b1cb78008da008..8c1241937892e1 100644
--- a/x-pack/plugins/security/server/authorization/check_privileges.test.ts
+++ b/x-pack/plugins/security/server/authorization/check_privileges.test.ts
@@ -48,7 +48,7 @@ describe('#atSpace', () => {
       const checkPrivilegesWithRequest = checkPrivilegesWithRequestFactory(
         mockActions,
         mockClusterClient,
-        () => application
+        application
       );
       const request = httpServerMock.createKibanaRequest();
       const checkPrivileges = checkPrivilegesWithRequest(request);
@@ -291,7 +291,7 @@ describe('#atSpaces', () => {
       const checkPrivilegesWithRequest = checkPrivilegesWithRequestFactory(
         mockActions,
         mockClusterClient,
-        () => application
+        application
       );
       const request = httpServerMock.createKibanaRequest();
       const checkPrivileges = checkPrivilegesWithRequest(request);
@@ -772,7 +772,7 @@ describe('#globally', () => {
       const checkPrivilegesWithRequest = checkPrivilegesWithRequestFactory(
         mockActions,
         mockClusterClient,
-        () => application
+        application
       );
       const request = httpServerMock.createKibanaRequest();
       const checkPrivileges = checkPrivilegesWithRequest(request);
diff --git a/x-pack/plugins/security/server/authorization/check_privileges.ts b/x-pack/plugins/security/server/authorization/check_privileges.ts
index 5bc3ce075452d4..3ef7a8f29a0bf2 100644
--- a/x-pack/plugins/security/server/authorization/check_privileges.ts
+++ b/x-pack/plugins/security/server/authorization/check_privileges.ts
@@ -61,7 +61,7 @@ export interface CheckPrivileges {
 export function checkPrivilegesWithRequestFactory(
   actions: CheckPrivilegesActions,
   clusterClient: IClusterClient,
-  getApplicationName: () => string
+  applicationName: string
 ) {
   const hasIncompatibleVersion = (
     applicationPrivilegesResponse: HasPrivilegesResponseApplication
@@ -81,23 +81,24 @@ export function checkPrivilegesWithRequestFactory(
         : [privilegeOrPrivileges];
       const allApplicationPrivileges = uniq([actions.version, actions.login, ...privileges]);
 
-      const application = getApplicationName();
       const hasPrivilegesResponse = (await clusterClient
         .asScoped(request)
         .callAsCurrentUser('shield.hasPrivileges', {
           body: {
-            applications: [{ application, resources, privileges: allApplicationPrivileges }],
+            applications: [
+              { application: applicationName, resources, privileges: allApplicationPrivileges },
+            ],
           },
         })) as HasPrivilegesResponse;
 
       validateEsPrivilegeResponse(
         hasPrivilegesResponse,
-        application,
+        applicationName,
         allApplicationPrivileges,
         resources
       );
 
-      const applicationPrivilegesResponse = hasPrivilegesResponse.application[application];
+      const applicationPrivilegesResponse = hasPrivilegesResponse.application[applicationName];
 
       if (hasIncompatibleVersion(applicationPrivilegesResponse)) {
         throw new Error(
diff --git a/x-pack/plugins/security/server/authorization/index.mock.ts b/x-pack/plugins/security/server/authorization/index.mock.ts
index 2e700745c69dcc..930ede4157723a 100644
--- a/x-pack/plugins/security/server/authorization/index.mock.ts
+++ b/x-pack/plugins/security/server/authorization/index.mock.ts
@@ -8,12 +8,15 @@ import { Actions } from '.';
 import { AuthorizationMode } from './mode';
 
 export const authorizationMock = {
-  create: ({ version = 'mock-version' }: { version?: string } = {}) => ({
+  create: ({
+    version = 'mock-version',
+    applicationName = 'mock-application',
+  }: { version?: string; applicationName?: string } = {}) => ({
     actions: new Actions(version),
     checkPrivilegesWithRequest: jest.fn(),
     checkPrivilegesDynamicallyWithRequest: jest.fn(),
     checkSavedObjectsPrivilegesWithRequest: jest.fn(),
-    getApplicationName: jest.fn().mockReturnValue('mock-application'),
+    applicationName,
     mode: { useRbacForRequest: jest.fn() } as jest.Mocked<AuthorizationMode>,
     privileges: { get: jest.fn() },
     registerPrivilegesWithCluster: jest.fn(),
diff --git a/x-pack/plugins/security/server/authorization/index.test.ts b/x-pack/plugins/security/server/authorization/index.test.ts
index 24179e062230a9..34b9efea771659 100644
--- a/x-pack/plugins/security/server/authorization/index.test.ts
+++ b/x-pack/plugins/security/server/authorization/index.test.ts
@@ -53,7 +53,6 @@ test(`returns exposed services`, () => {
     .fn()
     .mockReturnValue({ getSpaceId: jest.fn(), namespaceToSpaceId: jest.fn() });
   const mockFeaturesService = { getFeatures: () => [] };
-  const mockGetLegacyAPI = () => ({ kibanaIndexName });
   const mockLicense = licenseMock.create();
 
   const authz = setupAuthorization({
@@ -61,20 +60,20 @@ test(`returns exposed services`, () => {
     clusterClient: mockClusterClient,
     license: mockLicense,
     loggers: loggingServiceMock.create(),
-    getLegacyAPI: mockGetLegacyAPI,
+    kibanaIndexName,
     packageVersion: 'some-version',
     featuresService: mockFeaturesService,
     getSpacesService: mockGetSpacesService,
   });
 
   expect(authz.actions.version).toBe('version:some-version');
-  expect(authz.getApplicationName()).toBe(application);
+  expect(authz.applicationName).toBe(application);
 
   expect(authz.checkPrivilegesWithRequest).toBe(mockCheckPrivilegesWithRequest);
   expect(checkPrivilegesWithRequestFactory).toHaveBeenCalledWith(
     authz.actions,
     mockClusterClient,
-    authz.getApplicationName
+    authz.applicationName
   );
 
   expect(authz.checkPrivilegesDynamicallyWithRequest).toBe(
diff --git a/x-pack/plugins/security/server/authorization/index.ts b/x-pack/plugins/security/server/authorization/index.ts
index b5f9efadbd8d0e..41e6d12eb8f365 100644
--- a/x-pack/plugins/security/server/authorization/index.ts
+++ b/x-pack/plugins/security/server/authorization/index.ts
@@ -12,7 +12,7 @@ import {
   IClusterClient,
 } from '../../../../../src/core/server';
 
-import { FeaturesService, LegacyAPI, SpacesService } from '../plugin';
+import { FeaturesService, SpacesService } from '../plugin';
 import { Actions } from './actions';
 import { CheckPrivilegesWithRequest, checkPrivilegesWithRequestFactory } from './check_privileges';
 import {
@@ -43,7 +43,7 @@ interface SetupAuthorizationParams {
   license: SecurityLicense;
   loggers: LoggerFactory;
   featuresService: FeaturesService;
-  getLegacyAPI(): Pick<LegacyAPI, 'kibanaIndexName'>;
+  kibanaIndexName: string;
   getSpacesService(): SpacesService | undefined;
 }
 
@@ -52,7 +52,7 @@ export interface Authorization {
   checkPrivilegesWithRequest: CheckPrivilegesWithRequest;
   checkPrivilegesDynamicallyWithRequest: CheckPrivilegesDynamicallyWithRequest;
   checkSavedObjectsPrivilegesWithRequest: CheckSavedObjectsPrivilegesWithRequest;
-  getApplicationName: () => string;
+  applicationName: string;
   mode: AuthorizationMode;
   privileges: PrivilegesService;
   disableUnauthorizedCapabilities: (
@@ -69,23 +69,23 @@ export function setupAuthorization({
   license,
   loggers,
   featuresService,
-  getLegacyAPI,
+  kibanaIndexName,
   getSpacesService,
 }: SetupAuthorizationParams): Authorization {
   const actions = new Actions(packageVersion);
   const mode = authorizationModeFactory(license);
-  const getApplicationName = () => `${APPLICATION_PREFIX}${getLegacyAPI().kibanaIndexName}`;
+  const applicationName = `${APPLICATION_PREFIX}${kibanaIndexName}`;
   const checkPrivilegesWithRequest = checkPrivilegesWithRequestFactory(
     actions,
     clusterClient,
-    getApplicationName
+    applicationName
   );
   const privileges = privilegesFactory(actions, featuresService);
   const logger = loggers.get('authorization');
 
   const authz = {
     actions,
-    getApplicationName,
+    applicationName,
     checkPrivilegesWithRequest,
     checkPrivilegesDynamicallyWithRequest: checkPrivilegesDynamicallyWithRequestFactory(
       checkPrivilegesWithRequest,
@@ -123,7 +123,7 @@ export function setupAuthorization({
     registerPrivilegesWithCluster: async () => {
       validateFeaturePrivileges(actions, featuresService.getFeatures());
 
-      await registerPrivilegesWithCluster(logger, privileges, getApplicationName(), clusterClient);
+      await registerPrivilegesWithCluster(logger, privileges, applicationName, clusterClient);
     },
   };
 
diff --git a/x-pack/plugins/security/server/plugin.ts b/x-pack/plugins/security/server/plugin.ts
index cb197ecaf7e10a..84d448331cef25 100644
--- a/x-pack/plugins/security/server/plugin.ts
+++ b/x-pack/plugins/security/server/plugin.ts
@@ -4,7 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { Subscription } from 'rxjs';
+import { Subscription, combineLatest } from 'rxjs';
 import { first } from 'rxjs/operators';
 import {
   IClusterClient,
@@ -42,7 +42,6 @@ export type FeaturesService = Pick<FeaturesSetupContract, 'getFeatures'>;
  */
 export interface LegacyAPI {
   isSystemAPIRequest: (request: KibanaRequest) => boolean;
-  kibanaIndexName: string;
   cspRules: string;
   savedObjects: SavedObjectsLegacyService<KibanaRequest | LegacyRequest>;
   auditLogger: {
@@ -121,7 +120,10 @@ export class Plugin {
     core: CoreSetup,
     { features, licensing }: PluginSetupDependencies
   ): Promise<RecursiveReadonly<PluginSetupContract>> {
-    const config = await createConfig$(this.initializerContext, core.http.isTlsEnabled)
+    const [config, legacyConfig] = await combineLatest([
+      createConfig$(this.initializerContext, core.http.isTlsEnabled),
+      this.initializerContext.config.legacy.globalConfig$,
+    ])
       .pipe(first())
       .toPromise();
 
@@ -148,7 +150,7 @@ export class Plugin {
       clusterClient: this.clusterClient,
       license,
       loggers: this.initializerContext.logger,
-      getLegacyAPI: this.getLegacyAPI,
+      kibanaIndexName: legacyConfig.kibana.index,
       packageVersion: this.initializerContext.env.packageInfo.version,
       getSpacesService: this.getSpacesService,
       featuresService: features,
diff --git a/x-pack/plugins/security/server/routes/authorization/roles/get.test.ts b/x-pack/plugins/security/server/routes/authorization/roles/get.test.ts
index 1cfc1ae416ae47..447d890605cc9f 100644
--- a/x-pack/plugins/security/server/routes/authorization/roles/get.test.ts
+++ b/x-pack/plugins/security/server/routes/authorization/roles/get.test.ts
@@ -36,7 +36,7 @@ describe('GET role', () => {
   ) => {
     test(description, async () => {
       const mockRouteDefinitionParams = routeDefinitionParamsMock.create();
-      mockRouteDefinitionParams.authz.getApplicationName.mockReturnValue(application);
+      mockRouteDefinitionParams.authz.applicationName = application;
 
       const mockScopedClusterClient = elasticsearchServiceMock.createScopedClusterClient();
       mockRouteDefinitionParams.clusterClient.asScoped.mockReturnValue(mockScopedClusterClient);
diff --git a/x-pack/plugins/security/server/routes/authorization/roles/get.ts b/x-pack/plugins/security/server/routes/authorization/roles/get.ts
index be69e222dd0936..1173d37cba64f4 100644
--- a/x-pack/plugins/security/server/routes/authorization/roles/get.ts
+++ b/x-pack/plugins/security/server/routes/authorization/roles/get.ts
@@ -28,7 +28,7 @@ export function defineGetRolesRoutes({ router, authz, clusterClient }: RouteDefi
             body: transformElasticsearchRoleToRole(
               elasticsearchRole,
               request.params.name,
-              authz.getApplicationName()
+              authz.applicationName
             ),
           });
         }
diff --git a/x-pack/plugins/security/server/routes/authorization/roles/get_all.test.ts b/x-pack/plugins/security/server/routes/authorization/roles/get_all.test.ts
index 76ce6a272e2853..3bd85122c95d12 100644
--- a/x-pack/plugins/security/server/routes/authorization/roles/get_all.test.ts
+++ b/x-pack/plugins/security/server/routes/authorization/roles/get_all.test.ts
@@ -31,7 +31,7 @@ describe('GET all roles', () => {
   ) => {
     test(description, async () => {
       const mockRouteDefinitionParams = routeDefinitionParamsMock.create();
-      mockRouteDefinitionParams.authz.getApplicationName.mockReturnValue(application);
+      mockRouteDefinitionParams.authz.applicationName = application;
 
       const mockScopedClusterClient = elasticsearchServiceMock.createScopedClusterClient();
       mockRouteDefinitionParams.clusterClient.asScoped.mockReturnValue(mockScopedClusterClient);
diff --git a/x-pack/plugins/security/server/routes/authorization/roles/get_all.ts b/x-pack/plugins/security/server/routes/authorization/roles/get_all.ts
index f5d2d51280fc42..6ff431f0f8b6a7 100644
--- a/x-pack/plugins/security/server/routes/authorization/roles/get_all.ts
+++ b/x-pack/plugins/security/server/routes/authorization/roles/get_all.ts
@@ -22,11 +22,7 @@ export function defineGetAllRolesRoutes({ router, authz, clusterClient }: RouteD
         return response.ok({
           body: Object.entries(elasticsearchRoles)
             .map(([roleName, elasticsearchRole]) =>
-              transformElasticsearchRoleToRole(
-                elasticsearchRole,
-                roleName,
-                authz.getApplicationName()
-              )
+              transformElasticsearchRoleToRole(elasticsearchRole, roleName, authz.applicationName)
             )
             .sort((roleA, roleB) => {
               if (roleA.name < roleB.name) {
diff --git a/x-pack/plugins/security/server/routes/authorization/roles/put.test.ts b/x-pack/plugins/security/server/routes/authorization/roles/put.test.ts
index 31963987c2efb8..cb80549df8417c 100644
--- a/x-pack/plugins/security/server/routes/authorization/roles/put.test.ts
+++ b/x-pack/plugins/security/server/routes/authorization/roles/put.test.ts
@@ -62,7 +62,7 @@ const putRoleTest = (
 ) => {
   test(description, async () => {
     const mockRouteDefinitionParams = routeDefinitionParamsMock.create();
-    mockRouteDefinitionParams.authz.getApplicationName.mockReturnValue(application);
+    mockRouteDefinitionParams.authz.applicationName = application;
     mockRouteDefinitionParams.authz.privileges.get.mockReturnValue(privilegeMap);
 
     const mockScopedClusterClient = elasticsearchServiceMock.createScopedClusterClient();
diff --git a/x-pack/plugins/security/server/routes/authorization/roles/put.ts b/x-pack/plugins/security/server/routes/authorization/roles/put.ts
index 92c940132e6605..e0245e72604460 100644
--- a/x-pack/plugins/security/server/routes/authorization/roles/put.ts
+++ b/x-pack/plugins/security/server/routes/authorization/roles/put.ts
@@ -42,7 +42,7 @@ export function definePutRolesRoutes({ router, authz, clusterClient }: RouteDefi
 
         const body = transformPutPayloadToElasticsearchRole(
           request.body,
-          authz.getApplicationName(),
+          authz.applicationName,
           rawRoles[name] ? rawRoles[name].applications : []
         );