topgits usage test can now only run on 2.4+ due to fields

Author: Mpdreamz

src/Tests/Aggregations/Metric/TopHits/TopHitsAggregationUsageTests.cs

@@ -3,13 +3,15 @@
 using System.Linq;
 using FluentAssertions;
 using Nest;
+using Tests.Framework;
 using Tests.Framework.Integration;
 using Tests.Framework.ManagedElasticsearch.Clusters;
 using Tests.Framework.MockData;
 using static Nest.Infer;
 
 namespace Tests.Aggregations.Metric.TopHits
 {
+	[SkipVersion("<2.4.4", "fields only works in later 2.x versions")]
 	public class TopHitsAggregationUsageTests : AggregationUsageTestBase
 	{
 		public TopHitsAggregationUsageTests(ReadOnlyCluster i, EndpointUsage usage) : base(i, usage) { }