https://www.elastic.co/guide/en/elasticsearch/reference/7.x/query-dsl-minimum-should-match.html
https://www.elastic.co/guide/cn/elasticsearch/guide/current/index.html
https://www.elastic.co/guide/cn/elasticsearch/guide/current/_how_match_uses_bool.html

https://www.elastic.co/guide/en/elasticsearch/reference/7.x/full-text-queries.html

1 测试数据

### 删除
DELETE  /test_idx_2
### 查询
GET  /test_idx_2/_search
### 批量插入
POST _bulk
{"index":{"_index":"test_idx_2","_id":1}}
{"title":"a"}
{"index":{"_index":"test_idx_2","_id":2}}
{"title":"a b"}
{"index":{"_index":"test_idx_2","_id":3}}
{"title":"a b c"}
{"index":{"_index":"test_idx_2","_id":4}}
{"title":"a b c d"}
{"index":{"_index":"test_idx_2","_id":5}}
{"title":"a b c d e"}

2 使用

可以取值：https://www.elastic.co/guide/en/elasticsearch/reference/7.x/query-dsl-minimum-should-match.html

{
"query":{  
  "match":{  
    "字段名":{  
      "query":"查询内容",
      "operator":"or",
      "minimum_should_match":"参数"
      }
    }
  }
}

插入测试数据

### 删除
DELETE  /test_idx_2
### 查询
GET  /test_idx_2/_search
### 批量插入
POST _bulk
{"index":{"_index":"test_idx_2","_id":1}}
{"title":"a"}
{"index":{"_index":"test_idx_2","_id":2}}
{"title":"a b"}
{"index":{"_index":"test_idx_2","_id":3}}
{"title":"a b c"}
{"index":{"_index":"test_idx_2","_id":4}}
{"title":"a b c d"}
{"index":{"_index":"test_idx_2","_id":5}}
{"title":"a b c d e"}

“operator”:”or”，匹配到一个词即可查询到，所以这里所有的文档都能匹配到

### 全部匹配，5个
POST /test_idx_2/_search
{
  "query": {
    "match": {
      "title": {
        "query": "a b c d e",
        "operator": "or"
      }
    }
  }
}

“minimum_should_match”: “75%”，查询条件被分为5个词，5*75%=3.75，向下取整为3，也就是查询的文档分词后需要匹配3个词才可以

POST /test_idx_2/_search
{
  "query": {
    "match": {
      "title": {
        "query": "a b c d e",
        "operator": "or",
        "minimum_should_match": "75%"
      }
    }
  }
}

“minimum_should_match”:”-25%”，逆向匹配和正向匹配相反，比如我们可以近似理解为-25%和75%表示的是一个意思，但是有些小小的差异。查询条件被分为5个词，逆向匹配-25%，5*25%=1.25，取整是1，5-1=4，即要匹配4个词。

POST /test_idx_2/_search
{
  "query": {
    "match": {
      "title": {
        "query": "a b c d e",
        "operator": "or",
        "minimum_should_match": "-25%"
      }
    }
  }
}

match并不去看分词后的顺序，只要能匹配上即可

### 分词后的内容是无顺序的
POST /test_idx_2/_search
{
  "query": {
    "match": {
      "title": {
        "query": "a b c",
        "operator": "and"
      }
    }
  }
}
POST /test_idx_2/_search
{
  "query": {
    "match": {
      "title": {
        "query": "c b a",
        "operator": "and"
      }
    }
  }
}