Set _id field when creating index template

[newkate12 (Kate)]

I want to use index template when creating index in elasticsearch.
I saw that we can set _id field with specific field when creating index.
(https://www.elastic.co/guide/en/elasticsearch/reference/1.4/mapping-id-field.html)

Is it possible to set _id field when creating index template like this way?
For example, suppose that I want to set _id as "tag_seq" field when creating index template..

PUT _template/template_1
{
  "index_patterns": ["te*", "bar*"],
  "settings": {
    "number_of_shards": 1
  },
  "mappings": {
    "_source": {
      "enabled": false
    },
    "properties": {
      "host_name": {
        "type": "keyword"
      },
      "tag_seq" : {
        "type" : "integer"
      },
      "created_at": {
        "type": "date",
        "format": "EEE MMM dd HH:mm:ss Z yyyy"
      },
      "_id" : {
        "path" : "tag_seq",
        "type" : "integer"
      }
       
    }
  }
}

I tried to use the script above, but it gives me an error...

[mattkime (Matthew Kime)]

What version of the elasticsearch stack are you using and what error are you getting?

[newkate12 (Kate)]

My elasticsearch version is 7.3.2 and
I've got the error below.

{
  "error": {
    "root_cause": [
      {
        "type": "mapper_parsing_exception",
        "reason": "No type specified for field [_id]"
      }
    ],
    "type": "mapper_parsing_exception",
    "reason": "Failed to parse mapping [_doc]: No type specified for field [_id]",
    "caused_by": {
      "type": "mapper_parsing_exception",
      "reason": "No type specified for field [_id]"
    }
  },
  "status": 400
}

Without the _id setting part

"_id" : {
        "path" : "tag_seq",
        "type" : "integer"
      }

it works fine. Any Ideas?

[mattkime (Matthew Kime)]

Sorry I missed your response, did you resolve this?