NEST elastic client on date range query

Question

Please help me out with writing NEST query for below elastic DSL query

{
  "query": {
    "range": {
      "date_of_birth": {
        "format": "yyyy",
        "gte": "1990",
        "lte": "2020"
      }
    }
  }
}

This is what I have written as of now but I am not able to correct it.

var format = "yyyy";
var lowerBound = DateTime.Now.AddYears(-1);

var searchResponse = elasticClient.Search<PresentationDetails>(s => s
    .Index(indexAlias)
    .Type("presentation")
    .Size(1000)
    .Source(source => source
        .Includes(i => i
            .Fields(
                f => f.presentation_name
                )
            )
        )
    .Query(q => q
            .Range( r => r.Field("date_of_birth").GreaterThanOrEquals(lowerBound)
            )
        )
    .Scroll("20s")
    );

Answer 1

Using DateRange function helped.