Error: mapper_parsing_exception

Elastic Stack Elasticsearch
1

I try to create a new template with the following mapping in ES7. So far it worked in ES6.7 but do not find what's wrong.

PUT _template/connect
{
  "index_patterns": [
    "connect"
  ],
  "settings": {
    "index": {
      "number_of_shards": "1",
      "number_of_replicas": "1"
    }
  },
  "mappings": {
    "doc": {
      "properties": {
        "@timestamp": {
          "type": "date",
          "format": "epoch_second"
        }
      }
    }
  }
}

The error message looks as follows:

{
  "error": {
    "root_cause": [
      {
        "type": "mapper_parsing_exception",
        "reason": "Root mapping definition has unsupported parameters:  [doc : {properties={@timestamp={format=epoch_second, type=date}}}]"
      }
    ],
    "type": "mapper_parsing_exception",
    "reason": "Failed to parse mapping [_doc]: Root mapping definition has unsupported parameters:  [doc : {properties={@timestamp={format=epoch_second, type=date}}}]",
    "caused_by": {
      "type": "mapper_parsing_exception",
      "reason": "Root mapping definition has unsupported parameters:  [doc : {properties={@timestamp={format=epoch_second, type=date}}}]"
    }
  },
  "status": 400
}
2

Remove

    "doc": {
3

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