docs(plugin-docsearch): add example crawler config

Author: meteorlxy

docs/reference/plugin/docsearch.md

@@ -16,6 +16,43 @@ You need to [submit the URL of your site](https://docsearch.algolia.com/apply/)
 
 Alternatively, you can [run your own crawler](https://docsearch.algolia.com/docs/run-your-own/) to generate the index, and then use your own [appId](#appId), [apiKey](#apikey) and [indexName](#indexname) to configure this plugin.
 
+::: details Click to show the example crawler config
+```json{19-23,25-27}
+{
+  "index_name": "your_index_name",
+  "start_urls": [
+    "https://your.domain.name/"
+  ],
+  "stop_urls": [],
+  "selectors": {
+    "lvl0": {
+      "selector": "p.sidebar-heading.active",
+      "global": true,
+      "default_value": "Documentation"
+    },
+    "lvl1": ".theme-default-content h1",
+    "lvl2": ".theme-default-content h2",
+    "lvl3": ".theme-default-content h3",
+    "lvl4": ".theme-default-content h4",
+    "lvl5": ".theme-default-content h5",
+    "text": ".theme-default-content p, .theme-default-content li",
+    "lang": {
+      "selector": "/html/@lang",
+      "type": "xpath",
+      "global": true
+    }
+  },
+  "custom_settings": {
+    "attributesForFaceting": ["lang"]
+  }
+}
+```
+
+The above `selectors` is the configuration used for the default theme. You can modify them according to the theme you are using.
+
+Notice that the `selectors.lang` and the `custom_settings.attributesForFaceting` fields are **required** to make this plugin work properly.
+:::
+
 ## Options
 
 ### apiKey

docs/zh/reference/plugin/docsearch.md

@@ -16,6 +16,43 @@
 
 或者，你也可以 [运行你自己的爬虫](https://docsearch.algolia.com/docs/run-your-own/) 来创建索引，然后使用你自己的 [appId](#appId), [apiKey](#apikey) 和 [indexName](#indexname) 来配置该插件。
 
+::: details 点击查看爬虫配置示例
+```json{19-23,25-27}
+{
+  "index_name": "your_index_name",
+  "start_urls": [
+    "https://your.domain.name/"
+  ],
+  "stop_urls": [],
+  "selectors": {
+    "lvl0": {
+      "selector": "p.sidebar-heading.active",
+      "global": true,
+      "default_value": "Documentation"
+    },
+    "lvl1": ".theme-default-content h1",
+    "lvl2": ".theme-default-content h2",
+    "lvl3": ".theme-default-content h3",
+    "lvl4": ".theme-default-content h4",
+    "lvl5": ".theme-default-content h5",
+    "text": ".theme-default-content p, .theme-default-content li",
+    "lang": {
+      "selector": "/html/@lang",
+      "type": "xpath",
+      "global": true
+    }
+  },
+  "custom_settings": {
+    "attributesForFaceting": ["lang"]
+  }
+}
+```
+
+上述 `selectors` 是用于默认主题的配置，你可以根据你使用的主题来修改它们。
+
+注意 `selectors.lang` 和 `custom_settings.attributesForFaceting` 字段，它们是**必须**的，否则该插件将无法正常工作。
+:::
+
 ## 配置项
 
 ### apiKey