# copy_to（合并參數） 原文鏈接 : [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) 譯文鏈接 : [copy_to（合并參數）](/pages/viewpage.action?pageId=10027040) 貢獻者 : [程威](/display/~chengwei)，[ApacheCN](/display/~apachecn)，[Apache中文網](/display/~apachechina) **`copy_to`**?參數允許你創建自定義的?**[_all](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/mapping-all-field.html)?**字段.換句換來說,可以將多個字段的值復制到 **`group field`**（組字段）,然后可以作為單個字段進行查詢.例如,?**first_name**和?`**last_name**?`可以復制到?**`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）字段復制到**`full_name`**?字段. | | 3 | **`first_name`**（名字）和 **`last_name`**（姓氏）字段仍然可以分別查詢, **`full_name` **可以通過 **`first_name`**（名字）和 **`last_name`**（姓氏）來查詢. | 一些要點**:** * 復制的是字段值,而不是?**`term`**（詞條）（由分析過程產生）. * **`_source`** 字段不會被修改來顯示復制的值.? * 相同的值可以復制到多個字段,通過 **`"copy_to": [ "field_1", "field_2" ]`**?來操作.