Nest elasticsearch 7 Geolocation indexing

Elastic Stack Elasticsearch
2

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It looks like you're using NEST 7.x, based on the create index API call. I can't replicate what you're seeing with NEST 7.0.0-alpha2

private static void Main()
{
    var defaultIndex = "example_index";
    var pool = new SingleNodeConnectionPool(new Uri("http://localhost:9200"));

    var settings = new ConnectionSettings(pool)
        .DefaultIndex(defaultIndex);

    var client = new ElasticClient(settings);

    var createIndexResponse = client.CreateIndex("honadona", c => c
        .Map<ElasticSearchModel>(mm => mm
            .AutoMap()
        )
    );
}

public class ElasticSearchModel
{
	public GeoLocation Location { get; set; }
	public int Id { get; set; }
	public string BuildTitle { get; set; }
	public DateTime CreatedDate { get; set; }
	public int TotalRooms { get; set; }
	public string Description { get; set; }
	public decimal? OwnerPrice { get; set; }
	public double? Size { get; set; }
	public string SizeName { get; set; }
	public string MoneyType { get; set; }
	public string BuildAction { get; set; }
}

produces the following request

PUT http://localhost:9200/honadona?pretty=true 
{
  "mappings": {
    "properties": {
      "location": {
        "type": "geo_point"
      },
      "id": {
        "type": "integer"
      },
      "buildTitle": {
        "fields": {
          "keyword": {
            "ignore_above": 256,
            "type": "keyword"
          }
        },
        "type": "text"
      },
      "createdDate": {
        "type": "date"
      },
      "totalRooms": {
        "type": "integer"
      },
      "description": {
        "fields": {
          "keyword": {
            "ignore_above": 256,
            "type": "keyword"
          }
        },
        "type": "text"
      },
      "ownerPrice": {
        "type": "double"
      },
      "size": {
        "type": "double"
      },
      "sizeName": {
        "fields": {
          "keyword": {
            "ignore_above": 256,
            "type": "keyword"
          }
        },
        "type": "text"
      },
      "moneyType": {
        "fields": {
          "keyword": {
            "ignore_above": 256,
            "type": "keyword"
          }
        },
        "type": "text"
      },
      "buildAction": {
        "fields": {
          "keyword": {
            "ignore_above": 256,
            "type": "keyword"
          }
        },
        "type": "text"
      }
    }
  }
}

where location is geo_point. In your case, it sounds like the index may have already been created before this API call was made, possibly as a result of indexing a document before the explicit mapping for location was created. In this case, a mapping cannot be updated to be changed from one field datatype to another.

To resolve, you would need to delete the index and create it again, using a create index API call like above.