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                # _field_names field 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) |
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