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# Keep Words Token Filter(保留字过滤器) 原文链接 : [https://www.elastic.co/guide/en/elasticsearch/reference/5.3/getting-started.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/getting-started.html) 译文链接 : [http://www.apache.wiki/pages/viewpage.action?pageId=10028810](http://www.apache.wiki/pages/viewpage.action?pageId=10028810) 贡献者 : [李亚运](/display/~liyayun),[ApacheCN](/display/~apachecn),[Apache中文网](/display/~apachechina) ## 简述 `当词元过滤器中的type为keep时,表示`只保留具有预定义单词集中的文本的token。可以在设置中定义一组单词,或者从包含每行一个单词的文本文件加载。 ## 参数 | keep_words | 要保留的单词列表 | | keep_words_path | 一个文字文件的路径 | | keep_words_case | 一个布尔值,表示是否小写单词(默认为`false` ) | ## 示例 ``` PUT /keep_words_example { "settings" : { "analysis" : { "analyzer" : { "example_1" : { "tokenizer" : "standard", "filter" : ["standard", "lowercase", "words_till_three"] }, "example_2" : { "tokenizer" : "standard", "filter" : ["standard", "lowercase", "words_in_file"] } }, "filter" : { "words_till_three" : { "type" : "keep", "keep_words" : [ "one", "two", "three"] }, "words_in_file" : { "type" : "keep", "keep_words_path" : "analysis/example_word_list.txt" } } } } } ```