Add track_total_hits to search request body (#3917)

This commit removes track_total_hits as a query string parameter on a search request and instead defines it in the body, allowing track_total_hits to work with individual search requests in multi search API.

Closes #3906

(cherry picked from commit 75317ec)

Author: russcam

src/CodeGeneration/ApiGenerator/Configuration/Overrides/GlobalOverrides.cs

@@ -40,7 +40,8 @@ public class GlobalOverrides : EndpointOverridesBase
 			"copy_settings", //this still needs a PR?
 			"source", // allows the body to be specified as a request param, we do not want to advertise this with a strongly typed method
 			"timestamp",
-			"_source_include", "_source_exclude" // can be removed once https://github.com/elastic/elasticsearch/pull/41439 is in
+			"_source_include", "_source_exclude", // can be removed once https://github.com/elastic/elasticsearch/pull/41439 is in
+			"track_total_hits"
 		};
 	}
 }

src/Elasticsearch.Net/Api/RequestParameters/RequestParameters.NoNamespace.cs

@@ -1712,13 +1712,6 @@ public bool? TotalHitsAsInteger
 			set => Q("rest_total_hits_as_int", value);
 		}
 
-		///<summary>Indicate if the number of documents that match the query should be tracked</summary>
-		public bool? TrackTotalHits
-		{
-			get => Q<bool? >("track_total_hits");
-			set => Q("track_total_hits", value);
-		}
-
 		///<summary>Specify whether aggregation and suggester names should be prefixed by their respective types in the response</summary>
 		public bool? TypedKeys
 		{

src/Nest/Descriptors.NoNamespace.cs

@@ -1300,8 +1300,6 @@ public SearchDescriptor<TInferDocument> Index<TOther>()
 		public SearchDescriptor<TInferDocument> SuggestText(string suggesttext) => Qs("suggest_text", suggesttext);
 		///<summary>Indicates whether hits.total should be rendered as an integer or an object in the rest search response</summary>
 		public SearchDescriptor<TInferDocument> TotalHitsAsInteger(bool? totalhitsasinteger = true) => Qs("rest_total_hits_as_int", totalhitsasinteger);
-		///<summary>Indicate if the number of documents that match the query should be tracked</summary>
-		public SearchDescriptor<TInferDocument> TrackTotalHits(bool? tracktotalhits = true) => Qs("track_total_hits", tracktotalhits);
 		///<summary>Specify whether aggregation and suggester names should be prefixed by their respective types in the response</summary>
 		public SearchDescriptor<TInferDocument> TypedKeys(bool? typedkeys = true) => Qs("typed_keys", typedkeys);
 	}

src/Nest/Requests.NoNamespace.cs

@@ -2809,13 +2809,6 @@ public bool? TotalHitsAsInteger
 			set => Q("rest_total_hits_as_int", value);
 		}
 
-		///<summary>Indicate if the number of documents that match the query should be tracked</summary>
-		public bool? TrackTotalHits
-		{
-			get => Q<bool? >("track_total_hits");
-			set => Q("track_total_hits", value);
-		}
-
 		///<summary>Specify whether aggregation and suggester names should be prefixed by their respective types in the response</summary>
 		public bool? TypedKeys
 		{

src/Nest/Search/MultiSearch/MultiSearchJsonConverter.cs renamed to src/Nest/Search/MultiSearch/MultiSearchFormatter.cs

@@ -4,7 +4,7 @@
 
 namespace Nest
 {
-	internal class MultiSearchJsonConverter : IJsonFormatter<IMultiSearchRequest>
+	internal class MultiSearchFormatter : IJsonFormatter<IMultiSearchRequest>
 	{
 		private const byte Newline = (byte)'\n';
 

src/Nest/Search/MultiSearch/MultiSearchRequest.cs

@@ -6,7 +6,7 @@
 namespace Nest
 {
 	[MapsApi("msearch.json")]
-	[JsonFormatter(typeof(MultiSearchJsonConverter))]
+	[JsonFormatter(typeof(MultiSearchFormatter))]
 	public partial interface IMultiSearchRequest
 	{
 		IDictionary<string, ISearchRequest> Operations { get; set; }