Add shortcut properties for HistogramOrder (#6379) (#6380)

Co-authored-by: Steve Gordon <sgordon@hotmail.co.uk>

Author: github-actions[bot]

src/Elastic.Clients.Elasticsearch/Types/Aggregations/HistogramOrder.cs

@@ -0,0 +1,16 @@
+// 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.
+
+namespace Elastic.Clients.Elasticsearch.Aggregations;
+
+public partial class HistogramOrder
+{
+	public static HistogramOrder KeyDescending => new() { Key = SortOrder.Desc };
+
+	public static HistogramOrder KeyAscending => new() { Key = SortOrder.Asc };
+
+	public static HistogramOrder CountDescending => new() { Count = SortOrder.Desc };
+
+	public static HistogramOrder CountAscending => new() { Count = SortOrder.Asc };
+}

src/Elastic.Clients.Elasticsearch/Types/Aggregations/TermsBucket.cs

@@ -2,11 +2,10 @@
 // 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.
 
-namespace Elastic.Clients.Elasticsearch.Aggregations
+namespace Elastic.Clients.Elasticsearch.Aggregations;
+
+public class TermsBucket<TKey> : TermsBucketBase
 {
-	public class TermsBucket<TKey> : TermsBucketBase
-	{
-		public TKey Key { get; init; }
-		public string? KeyAsString { get; init; }
-	}
+	public TKey Key { get; init; }
+	public string? KeyAsString { get; init; }
 }

src/Playground/Program.cs

@@ -65,8 +65,7 @@
 		.DateHistogram("by-month", dh => dh
 			.CalendarInterval(CalendarInterval.Month)
 			.Field(fld => fld.Date)
-			//.Order(HistogramOrder.KeyDescending)
-			.Order(new HistogramOrder { Key = SortOrder.Desc })
+			.Order(HistogramOrder.KeyDescending)
 			.Aggregations(agg => agg
 				.Sum("trade-volumes", sum => sum.Field(fld => fld.Volume))))));