> For the complete documentation index, see [llms.txt](https://docs.mongoing.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mongoing.com/indexes/text-indexes/specify-name-for-text-index.md).

# 指定文本索引的名称

**在本页面**

* [指定`text`索引名称](#指定)
* [使用索引名称删除`text`索引](#使用)

> 在MONGODB 4.2中的改变
>
> 从4.2版本开始，由于[特性兼容性版本](https://docs.mongodb.com/master/reference/command/setFeatureCompatibilityVersion/#view-fcv)设置为\*\*“4.2”**或更大，MongoDB删除了最大127字节的**[**索引名长度**](https://docs.mongodb.com/master/reference/limits/#Index-Name-Length)**限制。在以前的版本或**[**特性兼容性版本**](https://docs.mongodb.com/master/reference/command/setFeatureCompatibilityVersion/#view-fcv)**(fCV)设置为**“4.0”\*\*的MongoDB版本中，索引名必须在这个限制之内。

索引的默认名称由与串联的每个索引字段名称组成`_text`。例如，下面的命令创建一个`text`上的字段索引`content`，`users.comments`和 `users.profiles`：

索引的默认名称由每个索引字段名和\*\*\_text**连接起来组成。例如，下面的命令在字段**content\*\*、**users.comments**和**users.profiles**上创建一个文本索引:

```
db.collection.createIndex(
   {
     content: "text",
     "users.comments": "text",
     "users.profiles": "text"
   }
)
```

索引的默认名称是：

```
"content_text_users.comments_text_users.profiles_text"
```

## 指定`text`索引名称

您可以将`name`选项传递给 [`db.collection.createIndex()`](https://docs.mongodb.com/master/reference/method/db.collection.createIndex/#db.collection.createIndex)方法：

```
db.collection.createIndex(
   {
     content: "text",
     "users.comments": "text",
     "users.profiles": "text"
   },
   {
     name: "MyTextIndex"
   }
)
```

## 使用索引名称删除`text`索引

无论是[文本](https://docs.mongodb.com/master/core/index-text/)索引具有默认名称或指定一个名称为[文本](https://docs.mongodb.com/master/core/index-text/)索引，删除该[文本](https://docs.mongodb.com/master/core/index-text/)索引，通过索引名称的[`db.collection.dropIndex()`](https://docs.mongodb.com/master/reference/method/db.collection.dropIndex/#db.collection.dropIndex)方法。

例如，考虑以下操作创建的索引:

```
db.collection.createIndex(
   {
     content: "text",
     "users.comments": "text",
     "users.profiles": "text"
   },
   {
     name: "MyTextIndex"
   }
)
```

然后，要删除此文本索引，请将名称传递`"MyTextIndex"`给 [`db.collection.dropIndex()`](https://docs.mongodb.com/master/reference/method/db.collection.dropIndex/#db.collection.dropIndex)方法，如下所示：

```
db.collection.dropIndex("MyTextIndex")
```

若要获取索引的名称，请使用 [`db.collection.getIndexes()`](https://docs.mongodb.com/master/reference/method/db.collection.getIndexes/#db.collection.getIndexes)方法。

译者：杨帅


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