Add updateable max* index settings

Relates: elastic/elasticsearch#27211

Author: russcam

src/Nest/IndexModules/IndexSettings/Settings/UpdatableIndexSettings.cs

@@ -15,6 +15,17 @@ public static class UpdatableIndexSettings
 		public const string CompoundFormat = "index.compound_format";
 		public const string CompoundOnFlush = "index.compound_on_flush";
 
+		/// <summary>the maximum difference between min_gram and max_gram for <see cref="INGramTokenizer"/> and <see cref="INGramTokenFilter"/></summary>
+		public const string MaxNGramDiff = "index.max_ngram_diff";
+		/// <summary>maximum value of from + size on a query</summary>
+		public const string MaxResultWindow = "index.max_result_window";
+		/// <summary>maximum value of from + size on an individual inner hit definition or top hits aggregation</summary>
+		public const string MaxInnerResultWindow = "index.max_inner_result_window";
+		/// <summary>maximum value of allowed script_fields that can be retrieved per search request.</summary>
+		public const string MaxScriptFields = "index.max_script_fields";
+		/// <summary>the maximum difference between min_shingle_size and max_shingle_size for <see cref="IShingleTokenFilter"/></summary>
+		public const string MaxShingleDiff = "index.max_shingle_diff";
+
 		public const string MergePolicyExpungeDeletesAllowed = "index.merge.policy.expunge_deletes_allowed";
 		public const string MergePolicyFloorSegment = "index.merge.policy.floor_segment";
 		public const string MergePolicyMaxMergeAtOnce = "index.merge.policy.max_merge_at_once";