Use Elasticsearch dsl python in order to Query a field that has a colon

Question

I use elasticsearch dsl python client in order to implement queries and run them against an ElasticSearch endpoint.

A successfull example of such query would be the following:

Search.filter("term", properties__grid=<some_string_here>)

which translates in

{
  "query": {
    "term": {
        "properties.grid": {
            "value": <some_string_here>
        }
    }
  }
}

The problem is that some fields contain a colon (example:properties.grid:code) and I have not found a way to implement the following query:

{
  "query": {
    "term": {
        "properties.grid:code": {
               "value": "MGRS-47RPH"
        }
    }
  }
}