Missing Value option NEST


I am currently trying to get data using aggregation based on a nullable date field. I am using NEST API with C#. Doing this using the low-level client it was possible to get the nullable items in a separate bucket using the missing option.

    "field" : "expiryDate",
    "missing": "1899-01-01",
        "key": "MissingExpiry",
        "to":  "2000-01-01"

In the NEST API this seems to be missing. In the sense that to get the nullable values a separate aggregation has to be used. Is the feature supported or is it typical to do something else in these situations.

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