refactor: apply review suggestions

Signed-off-by: Camila Belo <camilaibs@gmail.com>

plugins/search-backend-node/api-report-alpha.md

@@ -3,39 +3,12 @@
 > Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
 
 ```ts
-/// <reference types="node" />
-
-import { BackstageCredentials } from '@backstage/backend-plugin-api';
 import { DocumentTypeInfo } from '@backstage/plugin-search-common';
 import { ExtensionPoint } from '@backstage/backend-plugin-api';
-import { IndexableResultSet } from '@backstage/plugin-search-common';
 import { RegisterCollatorParameters } from '@backstage/plugin-search-backend-node';
 import { RegisterDecoratorParameters } from '@backstage/plugin-search-backend-node';
-import { SearchQuery } from '@backstage/plugin-search-common';
+import { SearchEngine } from '@backstage/plugin-search-backend-node';
 import { ServiceRef } from '@backstage/backend-plugin-api';
-import { Writable } from 'stream';
-
-// @public
-export type QueryRequestOptions =
-  | {
-      token?: string;
-    }
-  | {
-      credentials: BackstageCredentials;
-    };
-
-// @public
-export type QueryTranslator = (query: SearchQuery) => unknown;
-
-// @public
-export interface SearchEngine {
-  getIndexer(type: string): Promise<Writable>;
-  query(
-    query: SearchQuery,
-    options?: QueryRequestOptions,
-  ): Promise<IndexableResultSet>;
-  setTranslator(translator: QueryTranslator): void;
-}
 
 // @alpha
 export interface SearchEngineRegistryExtensionPoint {

plugins/search-backend-node/src/alpha.ts

@@ -30,14 +30,10 @@ import {
   RegisterDecoratorParameters,
 } from '@backstage/plugin-search-backend-node';
 
-import { SearchEngine } from './types';
-import { IndexBuilder } from './IndexBuilder';
-
-export type {
+import {
   SearchEngine,
-  QueryRequestOptions,
-  QueryTranslator,
-} from './types';
+  IndexBuilder,
+} from '@backstage/plugin-search-backend-node';
 
 /**
  * @alpha