Add support for pinned query (#7576)

* Generate pinned query

* Add tests

Author: stevejgordon

src/Elastic.Clients.Elasticsearch/_Generated/Types/QueryDsl/PinnedDoc.g.cs

@@ -0,0 +1,70 @@
+// 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.
+//
+// ███╗   ██╗ ██████╗ ████████╗██╗ ██████╗███████╗
+// ████╗  ██║██╔═══██╗╚══██╔══╝██║██╔════╝██╔════╝
+// ██╔██╗ ██║██║   ██║   ██║   ██║██║     █████╗
+// ██║╚██╗██║██║   ██║   ██║   ██║██║     ██╔══╝
+// ██║ ╚████║╚██████╔╝   ██║   ██║╚██████╗███████╗
+// ╚═╝  ╚═══╝ ╚═════╝    ╚═╝   ╚═╝ ╚═════╝╚══════╝
+// ------------------------------------------------
+//
+// This file is automatically generated.
+// Please do not edit these files manually.
+//
+// ------------------------------------------------
+
+#nullable restore
+
+using Elastic.Clients.Elasticsearch.Fluent;
+using Elastic.Clients.Elasticsearch.Serialization;
+using System;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Elastic.Clients.Elasticsearch.QueryDsl;
+
+public sealed partial class PinnedDoc
+{
+	[JsonInclude, JsonPropertyName("_id")]
+	public Elastic.Clients.Elasticsearch.Id Id { get; set; }
+	[JsonInclude, JsonPropertyName("_index")]
+	public Elastic.Clients.Elasticsearch.IndexName Index { get; set; }
+}
+
+public sealed partial class PinnedDocDescriptor : SerializableDescriptor<PinnedDocDescriptor>
+{
+	internal PinnedDocDescriptor(Action<PinnedDocDescriptor> configure) => configure.Invoke(this);
+
+	public PinnedDocDescriptor() : base()
+	{
+	}
+
+	private Elastic.Clients.Elasticsearch.Id IdValue { get; set; }
+	private Elastic.Clients.Elasticsearch.IndexName IndexValue { get; set; }
+
+	public PinnedDocDescriptor Id(Elastic.Clients.Elasticsearch.Id id)
+	{
+		IdValue = id;
+		return Self;
+	}
+
+	public PinnedDocDescriptor Index(Elastic.Clients.Elasticsearch.IndexName index)
+	{
+		IndexValue = index;
+		return Self;
+	}
+
+	protected override void Serialize(Utf8JsonWriter writer, JsonSerializerOptions options, IElasticsearchClientSettings settings)
+	{
+		writer.WriteStartObject();
+		writer.WritePropertyName("_id");
+		JsonSerializer.Serialize(writer, IdValue, options);
+		writer.WritePropertyName("_index");
+		JsonSerializer.Serialize(writer, IndexValue, options);
+		writer.WriteEndObject();
+	}
+}