案例一：短语搜索关键字字段。应仅返回完整短语匹配的结果（不应拆分短语）

使用keyword字段类型。
不应该拆分短语=>如果你使用keyword字段类型，这意味着没有文本分析器，它不会拆分短语。

案例二：对于其余字段，必须返回1个关键字匹配的结果。

标准分析仪将
使用text字段类型。
1关键字匹配必须返回结果=>标准（默认）分析器使用空格（和一些特殊字符）标记短语并将其拆分为单词。
我分享了一些例子来深入解释，希望有帮助。

#Put the documents.
PUT test_stack_over_flow/_doc/1
{
  "title": "Phrase search in multiple fields"
}

#check the mapping
GET test_stack_over_flow
"mappings": {
  "properties": {
    "title": {
      "type": "text",
      "fields": {
        "keyword": {
          "type": "keyword",
          "ignore_above": 256
        }
      }
    }
  }
}

#1hit
GET test_stack_over_flow/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "terms": {
            "title.keyword": [
              "Phrase search in multiple fields"
            ]
          }
        }
      ]
    }
  }
}

#0hit
GET test_stack_over_flow/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "terms": {
            "title.keyword": [
              "Phrase search in multiple"
            ]
          }
        }
      ]
    }
  }
}

#1hit
GET test_stack_over_flow/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "multi_match": {
            "query": "multiple",
            "fields": ["title"],
            "fuzziness": "AUTO"
          }
        }
      ]
    }
  }
}

#1 hit (because of fuzziness enabled)
GET test_stack_over_flow/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "multi_match": {
            "query": "multipl3",
            "fields": ["title"],
            "fuzziness": "AUTO"
          }
        }
      ]
    }
  }
}

#1 hit because of minimum_should_match:1 (default) and multi_match hit.
GET test_stack_over_flow/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "terms": {
            "title.keyword": [
              "Phrase search in multiple"
            ]
          }
        },
        {
          "multi_match": {
            "query": "multiple",
            "fields": ["title"],
            "fuzziness": "AUTO"
          }
        }
      ]
    }
  }
}

#0 hit because niehtier terms nor multi_match hit
GET test_stack_over_flow/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "terms": {
            "title.keyword": [
              "Phrase search in multiple"
            ]
          }
        },
        {
          "multi_match": {
            "query": "multi",
            "fields": ["title"],
            "fuzziness": "AUTO"
          }
        }
      ]
    }
  }
}

#1 hit because terms hit.
GET test_stack_over_flow/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "terms": {
            "title.keyword": [
              "Phrase search in multiple fields"
            ]
          }
        },
        {
          "multi_match": {
            "query": "multi",
            "fields": ["title"],
            "fuzziness": "AUTO"
          }
        }
      ]
    }
  }
}