为 文本 索引指定名称¶
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The default name for the index consists of each indexed field name concatenated with _text. For example, the following command creates a text index on the fields content, users.comments, and users.profiles:
db.collection.createIndex(
{
content: "text",
"users.comments": "text",
"users.profiles": "text"
}
)
索引的默认名称为：
"content_text_users.comments_text_users.profiles_text"
The text index, like other indexes, must fall within the index name length limit.
为 文本 索引指定名称¶
To avoid creating an index with a name that exceeds the index name length limit, you can pass the name option to the db.collection.createIndex() method:
db.collection.createIndex(
{
content: "text",
"users.comments": "text",
"users.profiles": "text"
},
{
name: "MyTextIndex"
}
)
使用索引名称来删除 文本 索引¶
Whether the text index has the default name or you specified a name for the text index, to drop the text index, pass the index name to the db.collection.dropIndex() method.
例如，假设由如下操作创建了一个索引：
db.collection.createIndex(
{
content: "text",
"users.comments": "text",
"users.profiles": "text"
},
{
name: "MyTextIndex"
}
)
Then, to remove this text index, pass the name "MyTextIndex" to the db.collection.dropIndex() method, as in the following:
db.collection.dropIndex("MyTextIndex")
To get the names of the indexes, use the db.collection.getIndexes() method.