Backport of #3289. Add scroll parameter to reindex.

Author: codebrain

src/CodeGeneration/ApiGenerator/RestSpecification/Core/reindex.patch.json

@@ -0,0 +1,12 @@
+{
+  "reindex": {
+    "url": {
+      "params": {
+        "scroll": {
+          "type" : "time",
+          "description" : "Specify how long a consistent view of the index should be maintained for scrolled search"
+        }
+      }
+    }
+  }
+}

src/Elasticsearch.Net/Domain/RequestParameters/RequestParameters.Generated.cs

@@ -1829,6 +1829,8 @@ public class ReindexOnServerRequestParameters : RequestParameters<ReindexOnServe
 		public long? RequestsPerSecond { get => Q<long?>("requests_per_second"); set => Q("requests_per_second", value); }
 		///<summary>The number of slices this task should be divided into. Defaults to 1 meaning the task isn't sliced into subtasks.</summary>
 		public long? Slices { get => Q<long?>("slices"); set => Q("slices", value); }
+		///<summary>Specify how long a consistent view of the index should be maintained for scrolled search</summary>
+		public TimeSpan Scroll { get => Q<TimeSpan>("scroll"); set => Q("scroll", value); }
 	}
 
 	///<summary>Request options for ReindexRethrottle<pre>https://www.elastic.co/guide/en/elasticsearch/reference/master/docs-reindex.html</pre></summary>

src/Nest/_Generated/_Descriptors.generated.cs

@@ -3023,6 +3023,8 @@ public partial class ReindexOnServerDescriptor  : RequestDescriptorBase<ReindexO
 		public ReindexOnServerDescriptor RequestsPerSecond(long? requestsPerSecond) => Qs("requests_per_second", requestsPerSecond);
 		///<summary>The number of slices this task should be divided into. Defaults to 1 meaning the task isn't sliced into subtasks.</summary>
 		public ReindexOnServerDescriptor Slices(long? slices) => Qs("slices", slices);
+		///<summary>Specify how long a consistent view of the index should be maintained for scrolled search</summary>
+		public ReindexOnServerDescriptor Scroll(Time scroll) => Qs("scroll", scroll);
 
 	}
 

src/Nest/_Generated/_Requests.generated.cs

@@ -4885,6 +4885,8 @@ public partial class ReindexOnServerRequest : PlainRequestBase<ReindexOnServerRe
 		public long? RequestsPerSecond { get => Q<long?>("requests_per_second"); set => Q("requests_per_second", value); }
 		///<summary>The number of slices this task should be divided into. Defaults to 1 meaning the task isn't sliced into subtasks.</summary>
 		public long? Slices { get => Q<long?>("slices"); set => Q("slices", value); }
+		///<summary>Specify how long a consistent view of the index should be maintained for scrolled search</summary>
+		public Time Scroll { get => Q<Time>("scroll"); set => Q("scroll", value); }
 	}
 
 	[JsonObject(MemberSerialization = MemberSerialization.OptIn)]