[8.19] Use Count instead of Count() (#8604) (#8620)

Co-authored-by: gpetrou <4172445+gpetrou@users.noreply.github.com>

Author: github-actions[bot]

src/Elastic.Clients.Elasticsearch/_Shared/Api/BulkRequest.cs

@@ -221,7 +221,7 @@ private BulkRequestDescriptor AddOperations<TSource, TDescriptor>(
 			return this;
 
 		var objectsList = @objects.ToList();
-		var operations = new List<IBulkOperation>(objectsList.Count());
+		var operations = new List<IBulkOperation>(objectsList.Count);
 
 		foreach (var o in objectsList)
 		{

src/Elastic.Clients.Elasticsearch/_Shared/Api/MultiSearchRequest.cs

@@ -17,7 +17,7 @@ public partial class MultiSearchResponse<TDocument>
 	public override bool IsValidResponse => base.IsValidResponse && (Responses?.All(b => b.Value1 is not null && b.Value1.Status == 200) ?? true);
 
 	[JsonIgnore]
-	public int TotalResponses => Responses.HasAny() ? Responses.Count() : 0;
+	public int TotalResponses => Responses.Count > 0 ? Responses.Count : 0;
 }
 
 public partial class MultiSearchRequest : IStreamSerializable

src/Elastic.Clients.Elasticsearch/_Shared/Api/MultiSearchTemplateRequest.cs

@@ -17,7 +17,7 @@ public partial class MultiSearchTemplateResponse<TDocument>
 	public override bool IsValidResponse => base.IsValidResponse && (Responses?.All(b => b.Value1 is not null && b.Value1.Status == 200) ?? true);
 
 	[JsonIgnore]
-	public int TotalResponses => Responses.HasAny() ? Responses.Count() : 0;
+	public int TotalResponses => Responses.Count > 0 ? Responses.Count : 0;
 }
 
 public partial class MultiSearchTemplateRequest : IStreamSerializable