es - elasticsearch - search - DSL - term level - terms_set

世界上并没有完美的程序，但是我们并不因此而沮丧，因为写程序就是一个不断追求完美的过程。

问：terms_set有什么特点？

答：

问：terms_set如何使用？

答：

# 删除
DELETE /terms_set_test

# 映射
PUT /terms_set_test
{
  "mappings": {
    "properties": {
      "name": {"type": "keyword"},
      "required_matches": {"type": "long"}
    }
  }
}

# 索引
POST /terms_set_test/_doc/1?refresh
{
  "name": ["hello", "good"],
  "required_matches": 2
}

# 索引
POST /terms_set_test/_doc/2?refresh
{
  "name": ["good", "me"],
  "required_matches": 3
}

# 索引
POST /terms_set_test/_doc/3?refresh
{
  "name": ["me", "hello"],
  "required_matches": 2
}

# 索引
POST /terms_set_test/_doc/4?refresh
{
 "name": ["good"],
 "required_matches": 1
}


# 搜索
GET /terms_set_test/_search
{
  "query": {
    "terms_set": {
      "name": {
        "terms": ["hello", "good", "me"],
        "minimum_should_match_field": "required_matches"
      }
    }  
  }
}

# 结果
{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 3,
      "relation" : "eq"
    },
    "max_score" : 1.6810182,
    "hits" : [
      {
        "_index" : "terms_set_test",
        "_type" : "_doc",
        "_id" : "3",
        "_score" : 1.6810182,
        "_source" : {
          "name" : [
            "me",
            "hello"
          ],
          "required_matches" : 2
        }
      },
      {
        "_index" : "terms_set_test",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.2730126,
        "_source" : {
          "name" : [
            "hello",
            "good"
          ],
          "required_matches" : 2
        }
      },
      {
        "_index" : "terms_set_test",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : 0.43250346,
        "_source" : {
          "name" : [
            "good"
          ],
          "required_matches" : 1
        }
      }
    ]
  }
}


# 搜索
GET /terms_set_test/_search
{
  "query": {
    "terms_set": {
      "name": {
        "terms": ["hello", "good", "me"],
        "minimum_should_match_script": {
          "source": "Math.min(params.num_terms, doc['required_matches'].value)"
        }
      }
    }
  }
}

# 结果
{
  "took" : 3,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 3,
      "relation" : "eq"
    },
    "max_score" : 1.6810182,
    "hits" : [
      {
        "_index" : "terms_set_test",
        "_type" : "_doc",
        "_id" : "3",
        "_score" : 1.6810182,
        "_source" : {
          "name" : [
            "me",
            "hello"
          ],
          "required_matches" : 2
        }
      },
      {
        "_index" : "terms_set_test",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.2730126,
        "_source" : {
          "name" : [
            "hello",
            "good"
          ],
          "required_matches" : 2
        }
      },
      {
        "_index" : "terms_set_test",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : 0.43250346,
        "_source" : {
          "name" : [
            "good"
          ],
          "required_matches" : 1
        }
      }
    ]
  }
}