文章目錄

• 概述
• 官方文檔
• 例子
• • tie_breaker

概述

繼續跟中華石杉老師學習ES，第十一篇

課程地址： https://www.roncoo.com/view/55

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官方文檔

https://www.elastic.co/guide/en/elasticsearch/guide/current/_tuning_best_fields_queries.html

https://www.elastic.co/guide/en/elasticsearch/reference/7.2/query-dsl-dis-max-query.html

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例子

數據同 上篇博文 構造索引的DSL

這次我們使用dis_max查詢 java beginner , DSL如下

GET /forum/article/_search {"query": {"dis_max": {"queries": [{"match": {"title": "java beginner"}},{"match": {"content": "java beginner"}}]}} }

返回

{"took": 2,"timed_out": false,"_shards": {"total": 1,"successful": 1,"skipped": 0,"failed": 0},"hits": {"total": 5,"max_score": 1.0341108,"hits": [{"_index": "forum","_type": "article","_id": "3","_score": 1.0341108,"_source": {"articleID": "JODL-X-1937-#pV7","userID": 2,"hidden": false,"postDate": "2017-01-01","tag": ["hadoop"],"tag_cnt": 1,"view_cnt": 100,"title": "this is elasticsearch blog","content": "i am only an elasticsearch beginner"}},{"_index": "forum","_type": "article","_id": "2","_score": 0.93952733,"_source": {"articleID": "KDKE-B-9947-#kL5","userID": 1,"hidden": false,"postDate": "2017-01-02","tag": ["java"],"tag_cnt": 1,"view_cnt": 50,"title": "this is java blog","content": "i think java is the best programming language"}},{"_index": "forum","_type": "article","_id": "4","_score": 0.79423964,"_source": {"articleID": "QQPX-R-3956-#aD8","userID": 2,"hidden": true,"postDate": "2017-01-02","tag": ["java","elasticsearch"],"tag_cnt": 2,"view_cnt": 80,"title": "this is java, elasticsearch, hadoop blog","content": "elasticsearch and hadoop are all very good solution, i am a beginner"}},{"_index": "forum","_type": "article","_id": "5","_score": 0.7116974,"_source": {"articleID": "DHJK-B-1395-#Ky5","userID": 3,"hidden": false,"postDate": "2019-05-01","tag": ["elasticsearch"],"tag_cnt": 1,"view_cnt": 10,"title": "this is spark blog","content": "spark is best big data solution based on scala ,an programming language similar to java"}},{"_index": "forum","_type": "article","_id": "1","_score": 0.4889865,"_source": {"articleID": "XHDK-A-1293-#fJ3","userID": 1,"hidden": false,"postDate": "2017-01-01","tag": ["java","hadoop"],"tag_cnt": 2,"view_cnt": 30,"title": "this is java and elasticsearch blog","content": "i like to write best elasticsearch article"}}]} }

不知道為啥id=3的相關度是最高的… 如果有知道的，煩請不吝賜教。

dis_max只取某一個query最大的分數，完全不考慮其他query的分數

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tie_breaker

使用tie_breaker將其他query的分數也考慮進去

tie_breaker參數的意義，在于說，將其他query的分數，乘以tie_breaker，然后綜合與最高分數的那個query的分數，綜合在一起進行計算，除了取最高分以外，還會考慮其他的query的分數。

tie_breaker的值，在0~1之間，是個小數。

GET /forum/article/_search {"query": {"dis_max": {"queries": [{"match": {"title": "java beginner"}},{"match": {"content": "java beginner"}}],"tie_breaker": 0.7}} }

返回結果

{"took": 2,"timed_out": false,"_shards": {"total": 1,"successful": 1,"skipped": 0,"failed": 0},"hits": {"total": 5,"max_score": 1.344432,"hits": [{"_index": "forum","_type": "article","_id": "2","_score": 1.344432,"_source": {"articleID": "KDKE-B-9947-#kL5","userID": 1,"hidden": false,"postDate": "2017-01-02","tag": ["java"],"tag_cnt": 1,"view_cnt": 50,"title": "this is java blog","content": "i think java is the best programming language"}},{"_index": "forum","_type": "article","_id": "4","_score": 1.1365302,"_source": {"articleID": "QQPX-R-3956-#aD8","userID": 2,"hidden": true,"postDate": "2017-01-02","tag": ["java","elasticsearch"],"tag_cnt": 2,"view_cnt": 80,"title": "this is java, elasticsearch, hadoop blog","content": "elasticsearch and hadoop are all very good solution, i am a beginner"}},{"_index": "forum","_type": "article","_id": "3","_score": 1.0341108,"_source": {"articleID": "JODL-X-1937-#pV7","userID": 2,"hidden": false,"postDate": "2017-01-01","tag": ["hadoop"],"tag_cnt": 1,"view_cnt": 100,"title": "this is elasticsearch blog","content": "i am only an elasticsearch beginner"}},{"_index": "forum","_type": "article","_id": "5","_score": 0.7116974,"_source": {"articleID": "DHJK-B-1395-#Ky5","userID": 3,"hidden": false,"postDate": "2019-05-01","tag": ["elasticsearch"],"tag_cnt": 1,"view_cnt": 10,"title": "this is spark blog","content": "spark is best big data solution based on scala ,an programming language similar to java"}},{"_index": "forum","_type": "article","_id": "1","_score": 0.4889865,"_source": {"articleID": "XHDK-A-1293-#fJ3","userID": 1,"hidden": false,"postDate": "2017-01-01","tag": ["java","hadoop"],"tag_cnt": 2,"view_cnt": 30,"title": "this is java and elasticsearch blog","content": "i like to write best elasticsearch article"}}]} }

總結

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