Add support for 'no_match_size' to HighlightFieldDescriptor

Author: yreynhout

src/Nest/DSL/HighlightFieldDescriptor.cs

@@ -21,6 +21,9 @@ public class HighlightFieldDescriptor<T> where T : class
 		[JsonProperty("fragment_size")]
 		internal int? _FragmentSize { get; set; }
 
+        [JsonProperty("no_match_size")]
+        internal int? _NoMatchSize { get; set; }
+
 		[JsonProperty("number_of_fragments")]
 		internal int? _NumberOfFragments { get; set; }
 
@@ -105,6 +108,11 @@ public HighlightFieldDescriptor<T> FragmentSize(int fragmentSize)
 			this._FragmentSize = fragmentSize;
 			return this;
 		}
+        public HighlightFieldDescriptor<T> NoMatchSize(int noMatchSize)
+        {
+            this._NoMatchSize = noMatchSize;
+            return this;
+        }
 		public HighlightFieldDescriptor<T> NumberOfFragments(int numberOfFragments)
 		{
 			this._NumberOfFragments = numberOfFragments;

src/Tests/Nest.Tests.Unit/Search/Highlight/HighlightTests.cs

@@ -26,6 +26,7 @@ public void TestHighlight()
 					.OnFields(
 					f => f
 						.OnAll()
+                        .NoMatchSize(200)
 						.PreTags("<em>")
 						.PostTags("</em>")
 					)
@@ -46,7 +47,8 @@ public void TestHighlight()
 			fields: {
 			  _all: {
 				pre_tags: [""<em>""],
-				post_tags: [""</em>""]
+				post_tags: [""</em>""],
+				no_match_size: 200
 			  }
 			},
 			require_field_match: true,