Add shard_stats to primary index stats (#6094) (#6096)

* Add shard_stats to primary index stats

* Remove BOM

Co-authored-by: Steve Gordon <[email protected]>

Author: github-actions[bot]

src/Nest/Indices/Monitoring/IndicesStats/IndexStats.cs

@@ -48,6 +48,9 @@ public class IndexStats
 		[DataMember(Name ="segments")]
 		public SegmentsStats Segments { get; set; }
 
+		[DataMember(Name = "shard_stats")]
+		public ShardTotalStats ShardStats { get; set; }
+
 		[DataMember(Name ="store")]
 		public StoreStats Store { get; set; }
 

src/Nest/Indices/Monitoring/IndicesStats/ShardTotalStats.cs

@@ -0,0 +1,14 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+using System.Runtime.Serialization;
+
+namespace Nest
+{
+	public class ShardTotalStats
+	{
+		[DataMember(Name = "total_count")]
+		public long TotalCount { get; set; }
+	}
+}