# _field_names field 原文鏈接 : [https://www.elastic.co/guide/en/elasticsearch/reference/5.3/mapping-field-names-field.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/mapping-field-names-field.html) 譯文鏈接 : [http://www.apache.wiki/display/Elasticsearch/_field_names+field](http://www.apache.wiki/display/Elasticsearch/_field_names+field) 貢獻者 : [朱彥安](/display/~zhuyanan)，[ApacheCN](/display/~apachecn)，[Apache中文網](/display/~apachechina) 該 **_field_names**字段索引包含除?**null?**之外的任何值的文檔中每個字段的名稱。 該字段通過?**[exists](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/query-dsl-exists-query.html)?**查詢以查找特定字段具有或不具有任何非空值的文檔。 該 **_field_names**字段的值可以在查詢中被訪問： ``` # Example documents PUT my_index/my_type/1 { "title": "This is a document" } PUT my_index/my_type/2?refresh=true { "title": "This is another document", "body": "This document has a body" } GET my_index/_search { "query": { "terms": { "_field_names": [ "title" ] # 1 } } } ``` | 1 | 在 **_field_names** 字段上查詢（參考 **[exists](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/query-dsl-exists-query.html)** 查詢） |