文章目录

概述

继续跟中华石杉老师学习ES，第十二篇

课程地址： /view/55

官网

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

示例

GET /forum/article/_search{"query": {"dis_max": {"queries": [{"match": {"title": {"query": "java beginner","minimum_should_match": "50%","boost": 2}}},{"match": {"content": {"query": "java beginner","minimum_should_match": "50%"}}}],"tie_breaker": 0.3}}}

可以简化为

GET /forum/article/_search{"query": {"multi_match": {"query": "java beginner","type": "best_fields","fields": ["title^2","content"],"tie_breaker": 0.3,"minimum_should_match": "50%"}}}

minimum_should_match的主要用途 ： 去长尾，long tail

长尾是什么呢，举个例子：假设你搜索5个关键词，但是很多结果是只匹配1个关键词的，其实跟你想要的结果相差甚远，这些结果就是长尾

minimum_should_match，控制搜索结果的精准度，只有匹配一定数量的关键词的数据，才能返回

返回结果

{"took": 1,"timed_out": false,"_shards": {"total": 1,"successful": 1,"skipped": 0,"failed": 0},"hits": {"total": 5,"max_score": 1.4387287,"hits": [{"_index": "forum","_type": "article","_id": "2","_score": 1.4387287,"_source": {"articleID": "KDKE-B-9947-#kL5","userID": 1,"hidden": false,"postDate": "-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": 1.2162449,"_source": {"articleID": "QQPX-R-3956-#aD8","userID": 2,"hidden": true,"postDate": "-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": "-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": "1","_score": 0.977973,"_source": {"articleID": "XHDK-A-1293-#fJ3","userID": 1,"hidden": false,"postDate": "-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"}},{"_index": "forum","_type": "article","_id": "5","_score": 0.7116974,"_source": {"articleID": "DHJK-B-1395-#Ky5","userID": 3,"hidden": false,"postDate": "-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"}}]}}