diff --git a/.changeset/nice-beans-wait.md b/.changeset/nice-beans-wait.md
new file mode 100644
index 0000000000..7cbdbc0fdf
--- /dev/null
+++ b/.changeset/nice-beans-wait.md
@@ -0,0 +1,7 @@
+---
+'@backstage/plugin-search-backend-module-techdocs': patch
+'@backstage/plugin-search-backend-module-catalog': patch
+'@backstage/plugin-search-backend-module-explore': patch
+---
+
+Migrated to support new auth services.
diff --git a/plugins/search-backend-module-catalog/api-report.md b/plugins/search-backend-module-catalog/api-report.md
index 6f5813ca9e..fc19ede2d4 100644
--- a/plugins/search-backend-module-catalog/api-report.md
+++ b/plugins/search-backend-module-catalog/api-report.md
@@ -5,6 +5,7 @@
 ```ts
 /// <reference types="node" />
 
+import { AuthService } from '@backstage/backend-plugin-api';
 import { CatalogApi } from '@backstage/catalog-client';
 import { CatalogEntityDocument } from '@backstage/plugin-catalog-common';
 import { Config } from '@backstage/config';
@@ -41,6 +42,7 @@ export class DefaultCatalogCollatorFactory implements DocumentCollatorFactory {
 
 // @public (undocumented)
 export type DefaultCatalogCollatorFactoryOptions = {
+  auth?: AuthService;
   discovery: PluginEndpointDiscovery;
   tokenManager: TokenManager;
   locationTemplate?: string;
diff --git a/plugins/search-backend-module-catalog/src/collators/DefaultCatalogCollatorFactory.ts b/plugins/search-backend-module-catalog/src/collators/DefaultCatalogCollatorFactory.ts
index 586346c385..166985f2d5 100644
--- a/plugins/search-backend-module-catalog/src/collators/DefaultCatalogCollatorFactory.ts
+++ b/plugins/search-backend-module-catalog/src/collators/DefaultCatalogCollatorFactory.ts
@@ -17,6 +17,7 @@
 import {
   PluginEndpointDiscovery,
   TokenManager,
+  createLegacyAuthAdapters,
 } from '@backstage/backend-common';
 import {
   CatalogApi,
@@ -33,9 +34,11 @@ import { Readable } from 'stream';
 import { CatalogCollatorEntityTransformer } from './CatalogCollatorEntityTransformer';
 import { readCollatorConfigOptions } from './config';
 import { defaultCatalogCollatorEntityTransformer } from './defaultCatalogCollatorEntityTransformer';
+import { AuthService } from '@backstage/backend-plugin-api';
 
 /** @public */
 export type DefaultCatalogCollatorFactoryOptions = {
+  auth?: AuthService;
   discovery: PluginEndpointDiscovery;
   tokenManager: TokenManager;
   /**
@@ -71,20 +74,26 @@ export class DefaultCatalogCollatorFactory implements DocumentCollatorFactory {
   private filter?: GetEntitiesRequest['filter'];
   private batchSize: number;
   private readonly catalogClient: CatalogApi;
-  private tokenManager: TokenManager;
   private entityTransformer: CatalogCollatorEntityTransformer;
+  private auth: AuthService;
 
   static fromConfig(
     configRoot: Config,
     options: DefaultCatalogCollatorFactoryOptions,
   ) {
     const configOptions = readCollatorConfigOptions(configRoot);
+    const { auth: adaptedAuth } = createLegacyAuthAdapters({
+      auth: options.auth,
+      discovery: options.discovery,
+      tokenManager: options.tokenManager,
+    });
     return new DefaultCatalogCollatorFactory({
       locationTemplate:
         options.locationTemplate ?? configOptions.locationTemplate,
       filter: options.filter ?? configOptions.filter,
       batchSize: options.batchSize ?? configOptions.batchSize,
       entityTransformer: options.entityTransformer,
+      auth: adaptedAuth,
       discovery: options.discovery,
       tokenManager: options.tokenManager,
       catalogClient: options.catalogClient,
@@ -96,17 +105,18 @@ export class DefaultCatalogCollatorFactory implements DocumentCollatorFactory {
     filter: GetEntitiesRequest['filter'];
     batchSize: number;
     entityTransformer?: CatalogCollatorEntityTransformer;
+    auth: AuthService;
     discovery: PluginEndpointDiscovery;
     tokenManager: TokenManager;
     catalogClient?: CatalogApi;
   }) {
     const {
+      auth,
       batchSize,
       discovery,
       locationTemplate,
       filter,
       catalogClient,
-      tokenManager,
       entityTransformer,
     } = options;
 
@@ -115,9 +125,9 @@ export class DefaultCatalogCollatorFactory implements DocumentCollatorFactory {
     this.batchSize = batchSize;
     this.catalogClient =
       catalogClient || new CatalogClient({ discoveryApi: discovery });
-    this.tokenManager = tokenManager;
     this.entityTransformer =
       entityTransformer ?? defaultCatalogCollatorEntityTransformer;
+    this.auth = auth;
   }
 
   async getCollator(): Promise<Readable> {
@@ -125,7 +135,6 @@ export class DefaultCatalogCollatorFactory implements DocumentCollatorFactory {
   }
 
   private async *execute(): AsyncGenerator<CatalogEntityDocument> {
-    const { token } = await this.tokenManager.getToken();
     let entitiesRetrieved = 0;
     let moreEntitiesToGet = true;
 
@@ -133,6 +142,10 @@ export class DefaultCatalogCollatorFactory implements DocumentCollatorFactory {
     // limit (and allow some control over) memory used by the search backend
     // at index-time.
     while (moreEntitiesToGet) {
+      const { token } = await this.auth.getPluginRequestToken({
+        onBehalfOf: await this.auth.getOwnServiceCredentials(),
+        targetPluginId: 'catalog',
+      });
       const entities = (
         await this.catalogClient.getEntities(
           {
diff --git a/plugins/search-backend-module-explore/api-report.md b/plugins/search-backend-module-explore/api-report.md
index 50cda184a9..43788340c0 100644
--- a/plugins/search-backend-module-explore/api-report.md
+++ b/plugins/search-backend-module-explore/api-report.md
@@ -5,6 +5,7 @@
 ```ts
 /// <reference types="node" />
 
+import { AuthService } from '@backstage/backend-plugin-api';
 import { Config } from '@backstage/config';
 import { DocumentCollatorFactory } from '@backstage/plugin-search-common';
 import { ExploreTool } from '@backstage/plugin-explore-common';
@@ -37,5 +38,6 @@ export type ToolDocumentCollatorFactoryOptions = {
   discovery: PluginEndpointDiscovery;
   logger: Logger;
   tokenManager?: TokenManager;
+  auth?: AuthService;
 };
 ```
diff --git a/plugins/search-backend-module-explore/src/collators/ToolDocumentCollatorFactory.ts b/plugins/search-backend-module-explore/src/collators/ToolDocumentCollatorFactory.ts
index bf6f07839b..daf83ec02b 100644
--- a/plugins/search-backend-module-explore/src/collators/ToolDocumentCollatorFactory.ts
+++ b/plugins/search-backend-module-explore/src/collators/ToolDocumentCollatorFactory.ts
@@ -17,7 +17,9 @@
 import {
   PluginEndpointDiscovery,
   TokenManager,
+  createLegacyAuthAdapters,
 } from '@backstage/backend-common';
+import { AuthService } from '@backstage/backend-plugin-api';
 import { Config } from '@backstage/config';
 import { ExploreTool } from '@backstage/plugin-explore-common';
 import {
@@ -44,6 +46,7 @@ export type ToolDocumentCollatorFactoryOptions = {
   discovery: PluginEndpointDiscovery;
   logger: Logger;
   tokenManager?: TokenManager;
+  auth?: AuthService;
 };
 
 /**
@@ -56,12 +59,13 @@ export class ToolDocumentCollatorFactory implements DocumentCollatorFactory {
 
   private readonly discovery: PluginEndpointDiscovery;
   private readonly logger: Logger;
-  private readonly tokenManager?: TokenManager;
+  private readonly auth: AuthService;
 
   private constructor(options: ToolDocumentCollatorFactoryOptions) {
     this.discovery = options.discovery;
     this.logger = options.logger;
-    this.tokenManager = options.tokenManager;
+
+    this.auth = createLegacyAuthAdapters(options).auth;
   }
 
   static fromConfig(
@@ -94,16 +98,13 @@ export class ToolDocumentCollatorFactory implements DocumentCollatorFactory {
   private async fetchTools() {
     const baseUrl = await this.discovery.getBaseUrl('explore');
 
-    let headers = {};
-
-    if (this.tokenManager) {
-      const { token } = await this.tokenManager.getToken();
-      headers = {
-        Authorization: `Bearer ${token}`,
-      };
-    }
-
-    const response = await fetch(`${baseUrl}/tools`, headers);
+    const { token } = await this.auth.getPluginRequestToken({
+      onBehalfOf: await this.auth.getOwnServiceCredentials(),
+      targetPluginId: 'explore',
+    });
+    const response = await fetch(`${baseUrl}/tools`, {
+      headers: { Authorization: `Bearer ${token}` },
+    });
 
     if (!response.ok) {
       throw new Error(
diff --git a/plugins/search-backend-module-techdocs/api-report.md b/plugins/search-backend-module-techdocs/api-report.md
index 592cf5065a..1a8c92e5bc 100644
--- a/plugins/search-backend-module-techdocs/api-report.md
+++ b/plugins/search-backend-module-techdocs/api-report.md
@@ -5,10 +5,12 @@
 ```ts
 /// <reference types="node" />
 
+import { AuthService } from '@backstage/backend-plugin-api';
 import { CatalogApi } from '@backstage/catalog-client';
 import { Config } from '@backstage/config';
 import { DocumentCollatorFactory } from '@backstage/plugin-search-common';
 import { Entity } from '@backstage/catalog-model';
+import { HttpAuthService } from '@backstage/backend-plugin-api';
 import { Logger } from 'winston';
 import { Permission } from '@backstage/plugin-permission-common';
 import { PluginEndpointDiscovery } from '@backstage/backend-common';
@@ -44,6 +46,8 @@ export type TechDocsCollatorFactoryOptions = {
   discovery: PluginEndpointDiscovery;
   logger: Logger;
   tokenManager: TokenManager;
+  auth?: AuthService;
+  httpAuth?: HttpAuthService;
   locationTemplate?: string;
   catalogClient?: CatalogApi;
   parallelismLimit?: number;
diff --git a/plugins/search-backend-module-techdocs/src/alpha.ts b/plugins/search-backend-module-techdocs/src/alpha.ts
index e8be7cc864..f7a6bb0d36 100644
--- a/plugins/search-backend-module-techdocs/src/alpha.ts
+++ b/plugins/search-backend-module-techdocs/src/alpha.ts
@@ -74,6 +74,8 @@ export default createBackendModule({
       deps: {
         config: coreServices.rootConfig,
         logger: coreServices.logger,
+        auth: coreServices.auth,
+        httpAuth: coreServices.httpAuth,
         discovery: coreServices.discovery,
         tokenManager: coreServices.tokenManager,
         scheduler: coreServices.scheduler,
@@ -83,6 +85,8 @@ export default createBackendModule({
       async init({
         config,
         logger,
+        auth,
+        httpAuth,
         discovery,
         tokenManager,
         scheduler,
@@ -106,6 +110,8 @@ export default createBackendModule({
           factory: DefaultTechDocsCollatorFactory.fromConfig(config, {
             discovery,
             tokenManager,
+            auth,
+            httpAuth,
             logger: loggerToWinstonLogger(logger),
             catalogClient: catalog,
             entityTransformer: transformer,
diff --git a/plugins/search-backend-module-techdocs/src/collators/DefaultTechDocsCollatorFactory.ts b/plugins/search-backend-module-techdocs/src/collators/DefaultTechDocsCollatorFactory.ts
index b76fedbdf9..1234c5c6fa 100644
--- a/plugins/search-backend-module-techdocs/src/collators/DefaultTechDocsCollatorFactory.ts
+++ b/plugins/search-backend-module-techdocs/src/collators/DefaultTechDocsCollatorFactory.ts
@@ -17,6 +17,7 @@
 import {
   PluginEndpointDiscovery,
   TokenManager,
+  createLegacyAuthAdapters,
 } from '@backstage/backend-common';
 import {
   CatalogApi,
@@ -41,6 +42,7 @@ import { Readable } from 'stream';
 import { Logger } from 'winston';
 import { TechDocsCollatorEntityTransformer } from './TechDocsCollatorEntityTransformer';
 import { defaultTechDocsCollatorEntityTransformer } from './defaultTechDocsCollatorEntityTransformer';
+import { AuthService, HttpAuthService } from '@backstage/backend-plugin-api';
 
 interface MkSearchIndexDoc {
   title: string;
@@ -57,6 +59,8 @@ export type TechDocsCollatorFactoryOptions = {
   discovery: PluginEndpointDiscovery;
   logger: Logger;
   tokenManager: TokenManager;
+  auth?: AuthService;
+  httpAuth?: HttpAuthService;
   locationTemplate?: string;
   catalogClient?: CatalogApi;
   parallelismLimit?: number;
@@ -84,8 +88,8 @@ export class DefaultTechDocsCollatorFactory implements DocumentCollatorFactory {
   private discovery: PluginEndpointDiscovery;
   private locationTemplate: string;
   private readonly logger: Logger;
+  private readonly auth: AuthService;
   private readonly catalogClient: CatalogApi;
-  private readonly tokenManager: TokenManager;
   private readonly parallelismLimit: number;
   private readonly legacyPathCasing: boolean;
   private entityTransformer: TechDocsCollatorEntityTransformer;
@@ -100,9 +104,14 @@ export class DefaultTechDocsCollatorFactory implements DocumentCollatorFactory {
       new CatalogClient({ discoveryApi: options.discovery });
     this.parallelismLimit = options.parallelismLimit ?? 10;
     this.legacyPathCasing = options.legacyPathCasing ?? false;
-    this.tokenManager = options.tokenManager;
     this.entityTransformer =
       options.entityTransformer ?? defaultTechDocsCollatorEntityTransformer;
+
+    this.auth = createLegacyAuthAdapters({
+      auth: options.auth,
+      discovery: options.discovery,
+      tokenManager: options.tokenManager,
+    }).auth;
   }
 
   static fromConfig(config: Config, options: TechDocsCollatorFactoryOptions) {
@@ -131,7 +140,7 @@ export class DefaultTechDocsCollatorFactory implements DocumentCollatorFactory {
   private async *execute(): AsyncGenerator<TechDocsDocument, void, undefined> {
     const limit = pLimit(this.parallelismLimit);
     const techDocsBaseUrl = await this.discovery.getBaseUrl('techdocs');
-    const { token } = await this.tokenManager.getToken();
+
     let entitiesRetrieved = 0;
     let moreEntitiesToGet = true;
 
@@ -141,6 +150,11 @@ export class DefaultTechDocsCollatorFactory implements DocumentCollatorFactory {
     // parallelism limit to simplify configuration.
     const batchSize = this.parallelismLimit * 50;
     while (moreEntitiesToGet) {
+      const { token: catalogToken } = await this.auth.getPluginRequestToken({
+        onBehalfOf: await this.auth.getOwnServiceCredentials(),
+        targetPluginId: 'catalog',
+      });
+
       const entities = (
         await this.catalogClient.getEntities(
           {
@@ -151,7 +165,7 @@ export class DefaultTechDocsCollatorFactory implements DocumentCollatorFactory {
             limit: batchSize,
             offset: entitiesRetrieved,
           },
-          { token },
+          { token: catalogToken },
         )
       ).items;
 
@@ -174,6 +188,12 @@ export class DefaultTechDocsCollatorFactory implements DocumentCollatorFactory {
               );
 
             try {
+              const { token: techdocsToken } =
+                await this.auth.getPluginRequestToken({
+                  onBehalfOf: await this.auth.getOwnServiceCredentials(),
+                  targetPluginId: 'techdocs',
+                });
+
               const searchIndexResponse = await fetch(
                 DefaultTechDocsCollatorFactory.constructDocsIndexUrl(
                   techDocsBaseUrl,
@@ -181,7 +201,7 @@ export class DefaultTechDocsCollatorFactory implements DocumentCollatorFactory {
                 ),
                 {
                   headers: {
-                    Authorization: `Bearer ${token}`,
+                    Authorization: `Bearer ${techdocsToken}`,
                   },
                 },
               );