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# copy_to(合并参数) 原文链接 : [https://www.elastic.co/guide/en/elasticsearch/reference/5.3/copy-to.html#copy-to](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/copy-to.html#copy-to) 译文链接 : [copy_to(合并参数)](/pages/viewpage.action?pageId=10027040) 贡献者 : [程威](/display/~chengwei),[ApacheCN](/display/~apachecn),[Apache中文网](/display/~apachechina) **`copy_to`** 参数允许你创建自定义的 **[_all](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/mapping-all-field.html) **字段.换句换来说,可以将多个字段的值复制到 **`group field`**(组字段),然后可以作为单个字段进行查询.例如, **first_name**和 `**last_name** `可以复制到 **`full_name `**字段中,如下所示 **:** ``` curl -XPUT 'localhost:9200/my_index?pretty' -H 'Content-Type: application/json' -d' { "mappings": { "my_type": { "properties": { "first_name": { "type": "text", "copy_to": "full_name" # 1 }, "last_name": { "type": "text", "copy_to": "full_name" # 2 }, "full_name": { "type": "text" } } } } } ' curl -XPUT 'localhost:9200/my_index/my_type/1?pretty' -H 'Content-Type: application/json' -d' { "first_name": "John", "last_name": "Smith" } ' curl -XGET 'localhost:9200/my_index/_search?pretty' -H 'Content-Type: application/json' -d' { "query": { "match": { "full_name": { # 3 "query": "John Smith", "operator": "and" } } } } ' ``` | 12 | **`first_name`**(名字)和 **`last_name`**(姓氏)字段复制到**`full_name`** 字段. | | 3 | **`first_name`**(名字)和 **`last_name`**(姓氏)字段仍然可以分别查询, **`full_name` **可以通过 **`first_name`**(名字)和 **`last_name`**(姓氏)来查询. | 一些要点**:** * 复制的是字段值,而不是 **`term`**(词条)(由分析过程产生). * **`_source`** 字段不会被修改来显示复制的值.  * 相同的值可以复制到多个字段,通过 **`"copy_to": [ "field_1", "field_2" ]`** 来操作.