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_type field

Deprecated in 6.0.0.

Each document indexed is associated with a _type and an _id. The _type field is indexed in order to make searching by type name fast.

The value of the _type field is accessible in queries, aggregations, scripts, and when sorting:

# Example documents

PUT my-index-000001/_doc/1?refresh=true
{
  "text": "Document with type 'doc'"
}

GET my-index-000001/_search
{
  "query": {
    "term": {
      "_type": "_doc"  
    }
  },
  "aggs": {
    "types": {
      "terms": {
        "field": "_type", 
        "size": 10
      }
    }
  },
  "sort": [
    {
      "_type": { 
        "order": "desc"
      }
    }
  ],
  "script_fields": {
    "type": {
      "script": {
        "lang": "painless",
        "source": "doc['_type']" 
      }
    }
  }
}

	Querying on the `_type` field
	Aggregating on the `_type` field
	Sorting on the `_type` field
	Accessing the `_type` field in scripts

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/mapping-type-field.html