diff --git a/docs/plugins/flexsearch.md b/docs/plugins/flexsearch.md
index bc9bcbc259..3bf0831b91 100644
--- a/docs/plugins/flexsearch.md
+++ b/docs/plugins/flexsearch.md
@@ -124,31 +124,6 @@ export default {
 }
 ```
 
-### getExtraFields
-
-- Type: `(page: Page) => string[]`
-
-- Default: `() => []`
-
-- Details:
-
-  A function to add extra fields to the search index of a page.
-
-  By default, this plugin will use page title and headers as the search index. This option could help you to add more searchable fields.
-
-- Example:
-
-```ts
-export default {
-  plugins: [
-    searchPlugin({
-      // allow searching the `tags` frontmatter
-      getExtraFields: (page) => page.frontmatter.tags ?? [],
-    }),
-  ],
-}
-```
-
 ## Styles
 
 You can customize the style of the search box via CSS variables:
diff --git a/plugins/plugin-flexsearch/src/node/flexsearchPlugin.ts b/plugins/plugin-flexsearch/src/node/flexsearchPlugin.ts
index 455a8b03ea..760b328cad 100644
--- a/plugins/plugin-flexsearch/src/node/flexsearchPlugin.ts
+++ b/plugins/plugin-flexsearch/src/node/flexsearchPlugin.ts
@@ -40,11 +40,6 @@ export interface SearchPluginOptions {
    * A function to determine whether a page should be included in the search index
    */
   isSearchable?: (page: Page) => boolean
-
-  /**
-   * A function to add extra fields to the search index of a page
-   */
-  getExtraFields?: (page: Page) => string[]
 }
 
 export const flexsearchPlugin = ({
@@ -52,7 +47,6 @@ export const flexsearchPlugin = ({
   hotKeys = ['s', '/'],
   maxSuggestions = 5,
   isSearchable = () => true,
-  getExtraFields = () => [],
 }: SearchPluginOptions = {}): Plugin => ({
   name: '@vuepress/plugin-flexsearch',
 
@@ -65,25 +59,23 @@ export const flexsearchPlugin = ({
   },
 
   onPrepared: async (app) => {
-    await prepareSearchIndex({ app, isSearchable, getExtraFields })
+    await prepareSearchIndex({ app, isSearchable })
   },
 
   onWatched: (app, watchers) => {
     // here we only watch the page data files
-    // if the extra fields generated by `getExtraFields` are not included
-    // in the page data, the changes may not be watched
     const searchIndexWatcher = chokidar.watch('pages/**/*.js', {
       cwd: app.dir.temp(),
       ignoreInitial: true,
     })
     searchIndexWatcher.on('add', () => {
-      prepareSearchIndex({ app, isSearchable, getExtraFields })
+      prepareSearchIndex({ app, isSearchable })
     })
     searchIndexWatcher.on('change', () => {
-      prepareSearchIndex({ app, isSearchable, getExtraFields })
+      prepareSearchIndex({ app, isSearchable })
     })
     searchIndexWatcher.on('unlink', () => {
-      prepareSearchIndex({ app, isSearchable, getExtraFields })
+      prepareSearchIndex({ app, isSearchable })
     })
     watchers.push(searchIndexWatcher)
   },
diff --git a/plugins/plugin-flexsearch/src/node/prepareSearchIndex.ts b/plugins/plugin-flexsearch/src/node/prepareSearchIndex.ts
index cd1e194aae..b487e03b90 100644
--- a/plugins/plugin-flexsearch/src/node/prepareSearchIndex.ts
+++ b/plugins/plugin-flexsearch/src/node/prepareSearchIndex.ts
@@ -31,11 +31,9 @@ const prepContent = (html: string): string => {
 export const prepareSearchIndex = async ({
   app,
   isSearchable,
-  getExtraFields,
 }: {
   app: App
   isSearchable: Required<SearchPluginOptions>['isSearchable']
-  getExtraFields: Required<SearchPluginOptions>['getExtraFields']
 }): Promise<string> => {
   // generate search index
   const pages = app.pages.filter(isSearchable)