关于elasticsearch(es)中查询minimum_should_match 参数的记录
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minimum_should_match 参数意思，自行查看官网或者搜索下
直接上结论 ：以"minimum_should_match" ：“2” 为例
1、搜索分词和文档分词匹配时，重复词语算作一个词语，也就是至少匹配到搜索分词词语中的2个不同的词语
2、分词器直接影响分词结果，可以设置不同的搜索分词器和文档分词器(或者通过fields 实现多分词器对文档分词，在搜索时指定分词器),如下
//搜索分词器和文档分词器设置为不同的分词器
PUT xxxxxxx
"mappings":
"properties":
"title":
"type": "text",
"analyzer": "ik_max_word",
"search_analyzer": "ik_smart",
"fields":
"keyword":
"ignore_above": 256,
"type": "keyword"
// 通过fields 实现多分词器对文档分词
PUT xxxxxxx
"mappings":
"properties":
"title":
"type": "text",
"fields":
"keyword":
"ignore_above": 256,
"type": "keyword"
,
"spy":
"type": "text",
"analyzer": "ik_smart"
,
"standard":
"type": "text",
"analyzer": "standard"
,
"fpy":
"type": "text",
"analyzer": "ik_max_word"
3、通过 _analyze 命令 查看分词结果，根据搜索内容分词和文档内容分词结果匹配是否至少匹配上2个不同的词语
GET _analyze
"analyzer":"ik_max_word",
"text": "搜索内容或文档内容"
以下是验证结论 1 ，结论2 3 都是实际使用中的一些技巧
1、 创建索引mapping
PUT test_search
"mappings":
"properties":
"id":
"type": "long"
,
"title":
"analyzer": "ik_max_word",
"type": "text",
"fields":
"keyword":
"ignore_above": 256,
"type": "keyword"
2、添加数据
POST /test_search/_doc/4
"id": 4,
"title": "蕉叶的蕉是一种叶子"
POST /test_search/_doc/5
"id": 5,
"title": "蕉叶的香是一种叶子"
3、搜索
GET test_search/_search
"explain": false,
"query":
"match":
"title":
"query": "香蕉",
"minimum_should_match": "2"
,
"highlight":
"fields":
"title":
搜索结果
"took" : 3,
"timed_out" : false,
"_shards" :
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
,
"hits" :
"total" :
"value" : 1,
"relation" : "eq"
,
"max_score" : 0.6312536,
"hits" : [
"_index" : "test_search",
"_type" : "_doc",
"_id" : "5",
"_score" : 0.6312536,
"_source" :
"id" : 5,
"title" : "蕉叶的香是一种叶子"
,
"highlight" :
"title" : [
"<em>蕉</em>叶的<em>香</em>是一种叶子"
]
]
4、查看分词匹配情况
GET _analyze
"analyzer":"ik_max_word",
"text": "香蕉"
分词结果
"tokens" : [
"token" : "香蕉",
"start_offset" : 0,
"end_offset" : 2,
"type" : "CN_WORD",
"position" : 0
,
"token" : "香",
"start_offset" : 0,
"end_offset" : 1,
"type" : "CN_WORD",
"position" : 1
,
"token" : "蕉",
"start_offset" : 1,
"end_offset" : 2,
"type" : "CN_WORD",
"position" : 2
]
同理获取到
蕉叶的香是一种叶子的结果，能匹配到 一个蕉和一个香
"tokens" : [
"token" : "蕉叶",
"start_offset" : 0,
"end_offset" : 2,
"type" : "CN_WORD",
"position" : 0
,
"token" : "蕉",
"start_offset" : 0,
"end_offset" : 1,
"type" : "CN_WORD",
"position" : 1
,
"token" : "叶的",
"start_offset" : 1,
"end_offset" : 3,
"type" : "CN_WORD",
"position" : 2
,
"token" : "叶",
"start_offset" : 1,
"end_offset" : 2,
"type" : "CN_WORD",
"position" : 3
,
"token" : "的",
"start_offset" : 2,
"end_offset" : 3,
"type" : "CN_WORD",
"position" : 4
,
"token" : "香",
"start_offset" : 3,
"end_offset" : 4,
"type" : "CN_WORD",
"position" : 5
,
"token" : "是",
"start_offset" : 4,
"end_offset" : 5,
"type" : "CN_WORD",
"position" : 6
,
"token" : "一种",
"start_offset" : 5,
"end_offset" : 7,
"type" : "CN_WORD",
"position" : 7
,
"token" : "一",
"start_offset" : 5,
"end_offset" : 6,
"type" : "CN_WORD",
"position" : 8
,
"token" : "种",
"start_offset" : 6,
"end_offset" : 7,
"type" : "CN_WORD",
"position" : 9
,
"token" : "叶子",
"start_offset" : 7,
"end_offset" : 9,
"type" : "CN_WORD",
"position" : 10
,
"token" : "叶",
"start_offset" : 7,
"end_offset" : 8,
"type" : "CN_WORD",
"position" : 11
,
"token" : "子",
"start_offset" : 8,
"end_offset" : 9,
"type" : "CN_WORD",
"position" : 12
]
蕉叶的蕉是一种叶子，能匹配到 两个蕉
"tokens" : [
"token" : "蕉叶",
"start_offset" : 0,
"end_offset" : 2,
"type" : "CN_WORD",
"position" : 0
,
"token" : "蕉",
"start_offset" : 0,
"end_offset" : 1,
"type" : "CN_WORD",
"position" : 1
,
"token" : "叶的",
"start_offset" : 1,
"end_offset" : 3,
"type" : "CN_WORD",
"position" : 2
,
"token" : "叶",
"start_offset" : 1,
"end_offset" : 2,
"type" : "CN_WORD",
"position" : 3
,
"token" : "的",
"start_offset" : 2,
"end_offset" : 3,
"type" : "CN_WORD",
"position" : 4
,
"token" : "蕉",
"start_offset" : 3,
"end_offset" : 4,
"type" : "CN_WORD",
"position" : 5
,
"token" : "是",
"start_offset" : 4,
"end_offset" : 5,
"type" : "CN_WORD",
"position" : 6
,
"token" : "一种",
"start_offset" : 5,
"end_offset" : 7,
"type" : "CN_WORD",
"position" : 7
,
"token" : "一",
"start_offset" : 5,
"end_offset" : 6,
"type" : "CN_WORD",
"position" : 8
,
"token" : "种",
"start_offset" : 6,
"end_offset" : 7,
"type" : "CN_WORD",
"position" : 9
,
"token" : "叶子",
"start_offset" : 7,
"end_offset" : 9,
"type" : "CN_WORD",
"position" : 10
,
"token" : "叶",
"start_offset" : 7,
"end_offset" : 8,
"type" : "CN_WORD",
"position" : 11
,
"token" : "子",
"start_offset" : 8,
"end_offset" : 9,
"type" : "CN_WORD",
"position" : 12
]
“蕉叶的香是一种叶子” 的结果，能匹配到 一个 “蕉“和一个“香“
“蕉叶的蕉是一种叶子” 的结果，能匹配到 两个“蕉“
搜索结果显示只 有 “蕉叶的香是一种叶子”，所以 "minimum_should_match" ："2" 表示是不同的词语的个数
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