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                # Norms (標準信息) **norms?**存儲各種標準化因子,為后續查詢計算文檔對該查詢的匹配分數提供依據。 雖然?**norms?**參數對評分很有用,但他需要占用大量的磁盤空間(通常是為了索引每個文檔中每個字段每個字節的順序,甚至不包含此字段的文檔也是如此)。因此,如果你不需要計算此字段的評分,應該在改字段取消?**norms?**的功能.特別是那些僅僅只是用做過濾條件或者聚合條件的字段。 注意 同一索引具有相同名字的字段必須設置相同的?**norms?**值。**norms?**將會因為已存在的字段使用?**[PUT mapping API](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/indices-put-mapping.html "Put Mapping")?**而失效。 **norms?**可以在之后被取消(但不能再次啟用),如下所示使用?**[PUT mapping API](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/indices-put-mapping.html "Put Mapping"):** ``` curl -XPUT 'localhost:9200/my_index/_mapping/my_type?pretty' -H 'Content-Type: application/json' -d' { "properties": { "title": { "type": "text", "norms": false } } } ' ``` 備注:**norms?**不會被立刻刪除,但是當繼續索引新文檔時,舊?**segments** (段)將合并到新的?**segments** (段)后,**norms?**將被刪除.當分數計算作用在這種刪除?**norms?**的字段上時,可能會出現不一致的結果,因為其中有些文檔含有?**norms**,另外一些文檔不含有?**norms**. 原文鏈接 : [https://www.elastic.co/guide/en/elasticsearch/reference/5.3/norms.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/norms.html)(修改該鏈接為官網對應的鏈接) 譯文鏈接 : [http://www.apache.wiki/pages/viewpage.action?pageId=9406023](http://www.apache.wiki/pages/viewpage.action?pageId=9406023)(修改該鏈接為 **ApacheCN** 對應的譯文鏈接) 貢獻者 : [郭峰](/display/~guofeng),[ApacheCN](/display/~apachecn),[Apache中文網](/display/~apachechina)
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