如何在Elasticsearch 7.7.0及更高版本中进行精确的子字符串匹配

如何解决如何在Elasticsearch 7.7.0及更高版本中进行精确的子字符串匹配

这是我的es索引

PUT /recharge
{
  "mappings": {
      "properties": {
        "word": {"type": "text"},"varients": {
          "type": "object","properties": {
            "w": {"type": "text"}
        }
      }
    }
  }
}

POST recharge/_doc/1
{
  "word": "International roaming","varients": [
    {
      "w": "international roaming"
    }
  ]
}

POST recharge/_doc/2
{
  "word": "domestic roaming","varients": [
    {
      "w": "domestic roaming"
    },{
      "w": "roaming"
    }
  ]
}

我正在向弹性搜索发送以下查询，并获得以下输出

GET recharge/_search
{
  "query": {
    "multi_match": {
      "query": "I want International roaming pack for my number","fields": ["varients.w","word"]
    }
  }
}

在输出结果中我得到

{"title": "Domestic roaming"}
{"title": "International roaming"}

在字符串匹配的情况下，我不希望两个输出都匹配，而是只希望与查询部分完全匹配的字符串。即{"title": "International roaming"}

我只需要从查询部分中进行准确的搜索，如下所示：

I require international roaming packs

{"title": "International roaming"}

I require domestic roaming packs

{"title": "Domestic roaming"}