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                # _meta field 原文鏈接 : [https://www.elastic.co/guide/en/elasticsearch/reference/5.3/mapping-meta-field.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/mapping-meta-field.html) 譯文鏈接 : [http://www.apache.wiki/display/Elasticsearch/_meta+field](http://www.apache.wiki/display/Elasticsearch/_meta+field) 貢獻者 : [朱彥安](/display/~zhuyanan),[ApacheCN](/display/~apachecn),[Apache中文網](/display/~apachechina) 每個 **mapping** **type**(映射類型)都可以有與之相關聯的自定義元數據。 這些數據完全不用于 **Elasticsearch**,但可用于存儲應用程序特定的元數據,例如文檔所屬的類 :? ``` curl -XPUT 'localhost:9200/my_index?pretty' -H 'Content-Type: application/json' -d' { "mappings": { "user": { "_meta": { "class": "MyApp::User", "version": { "min": "1.0", "max": "1.3" } } } } } ' ``` | 1 | 可以使用?[GET mapping](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/indices-get-mapping.html)**API** 來獲取 **_meta** 的信息。 | 該 **_meta**字段可以使用 [PUT mapping](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/indices-put-mapping.html)**?API**?在現有類型上進行更新。
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