ElasticSearch术语聚合

Question

我正在尝试使用以下查询对以下数据进行elasticsearch来执行术语聚合，输出将名称分解为标记（请参见下面的输出）。因此，我尝试将os_name映射为multi_field，但现在无法通过它查询。是否可以有没有令牌的索引？例如“
Fedora Core”？

查询：

GET /temp/example/_search
{
  "size": 0,
  "aggs": {
     "OS": {
       "terms": {
           "field": "os_name"
       }
     }
  }
}

数据：

...
    {
        "_index": "temp",
        "_type": "example",
        "_id": "3",
        "_score": 1,
        "_source": {
           "title": "system3",
           "os_name": "Fedora Core",
           "os_version": 18
        }
     },
     {
        "_index": "temp",
        "_type": "example",
        "_id": "1",
        "_score": 1,
        "_source": {
           "title": "system1",
           "os_name": "Fedora Core",
           "os_version": 20
        }
     },
     {
        "_index": "temp",
        "_type": "example",
        "_id": "2",
        "_score": 1,
        "_source": {
           "title": "backup",
           "os_name": "Yellow Dog",
           "os_version": 6
        }
     }
...

输出：

       ...
        {
           "key": "core",
           "doc_count": 2
        },
        {
           "key": "fedora",
           "doc_count": 2
        },
        {
           "key": "dog",
           "doc_count": 1
        },
        {
           "key": "yellow",
           "doc_count": 1
        }
       ...

映射：

PUT /temp
{
  "mappings": {
    "example": {
      "properties": {
        "os_name": {
          "type": "string"
        },
        "os_version": {
          "type": "long"
        },
        "title": {
          "type": "string"
        }
      }
    }
  }
}

Answer 1

实际上，您应该像这样更改映射

"os_name": {
  "type": "string",
  "fields": {
     "raw": {
        "type": "string",
        "index": "not_analyzed"
     }
  }
},

并且您的aggs应该更改为：

GET /temp/example/_search
{
  "size": 0,
  "aggs": {
     "OS": {
       "terms": {
           "field": "os_name.raw"
       }
     }
  }
}