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                # String 原文鏈接 :[https://www.elastic.co/guide/en/elasticsearch/reference/5.4/analysis-common-grams-tokenfilter.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.4/analysis-common-grams-tokenfilter.html) 譯文鏈接 :[http://www.apache.wiki/display/Elasticsearch/String](http://www.apache.wiki/display/Elasticsearch/String) 貢獻者 : [李亞運](/display/~liyayun),[ApacheCN](/display/~apachecn),[Apache中文網](/display/~apachechina) ## 簡述 `string`字段不支持在5.x中創建的索引,這是因為`text`和`keyword`字段。在5.x中創建的索引中創建字符串字段將導致Elasticsearch嘗試將`string`升級到相應的`text`或`keyword`字段。它將返回一個HTTP?`Warning`請求頭,告訴您該`string`已被棄用。此升級過程并不總是完美的,因為有一些string支持的組合功能,但不被`text`和`keyword支持`?。?因此,最好使用`text`或`keyword`?。 從2.x導入的索引僅支持`string`?,而不支持`text`或`keyword`?。?為了簡化從2.x Elasticsearch的遷移,將應用于從2.x導入的索引的`text`和`keyword`映射降級為`string`?。?最終,低于5.x版本的長期索引需要及時重建,截止時間為升級到6.x之前,這種降級可以在您分配合理后時間平滑進行。
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