Serialize GeoLocation with internal serializer

src/Serializers/Nest.JsonNetSerializer/Converters/HandleNestTypesOnSourceJsonConverter.cs

@@ -16,7 +16,8 @@ public class HandleNestTypesOnSourceJsonConverter : JsonConverter
 			typeof(CompletionField),
 			typeof(Attachment),
 			typeof(ILazyDocument),
-			typeof(GeoCoordinate)
+			typeof(GeoCoordinate),
+			typeof(GeoLocation)
 		};
 
 		private readonly IElasticsearchSerializer _builtInSerializer;

src/Tests/Tests.Reproduce/GitHubIssue3981.cs

@@ -0,0 +1,31 @@
+using System.Text;
+using Elastic.Xunit.XunitPlumbing;
+using FluentAssertions;
+using Nest;
+using Tests.Core.Client;
+
+namespace Tests.Reproduce
+{
+	public class GitHubIssue3981
+	{
+		// This test always passes because the JsonPropertyAttribute on
+		// the GeoLocation type are recognized by the JsonNetSerializer when used in tests, because the
+		// IL rewriting to internalize Json.NET in the client happens *after* tests are run.
+		[U]
+		public void JsonNetSerializerSerializesGeoLocation()
+		{
+			var document = new Document
+			{
+				Location = new GeoLocation(45, 45)
+			};
+
+			var indexResponse = TestClient.InMemoryWithJsonNetSerializer.IndexDocument(document);
+			Encoding.UTF8.GetString(indexResponse.ApiCall.RequestBodyInBytes).Should().Contain("\"lat\"").And.Contain("\"lon\"");
+		}
+
+		private class Document
+		{
+			public GeoLocation Location { get; set; }
+		}
+	}
+}