How to properly define a hashmap in ElasticSearch

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I am using dynamic mapping in ElasticSearch.

I use it because my index is long and I need to use the template feature in order to avoid updating definitions in multiple places (My other question here).

I am sending the following json (Object Zoo) which contains a HashMap as an example:

Put 127.0.0.1:9200/myIndex/Zoo/10
{
  "id" : 1,
  "Name" : "Madagascar",
  "map" : {
    "1" : {
      "id" : -4944060986111146989,
      "name" : null
    },
    "2" : {
      "id" : 5073063561743125202,
      "name" : null
    },
    "3" : {
      "id" : -1777985506870671559,
      "name" : null
    }
  }
}

This creates the following Index

{
    "mm3_v2": {
        "mappings": {
            "Zoo": {
                "properties": {
                    "Name": {
                        "type": "string"
                    },
                    "id": {
                        "type": "long"
                    },
                    "map": {
                        "properties": {
                            "1": {
                                "properties": {
                                    "id": {
                                        "type": "long"
                                    }
                                }
                            },
                            "2": {
                                "properties": {
                                    "id": {
                                        "type": "long"
                                    }
                                }
                            },
                            "3": {
                                "properties": {
                                    "id": {
                                        "type": "long"
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

In this example the inner object in the hashmap is short.
In real life my hashmap's object can be long.

This can create a huge index files (easily 1M rows) and for each object it repeats exactly the same definition.
(e.g. when stored in a List, the mapping does not repeat itself)

Is there a way to properly define a hashmap in elastic search?