Fix #1027: CommonTermsQuery serializing incorrectly

Author: gmarz

src/Nest/DSL/Query/IQueryContainer.cs

@@ -77,7 +77,7 @@ public interface IQueryContainer : ICustomJson
 		[JsonConverter(typeof(CompositeJsonConverter<GeoShapeQueryJsonReader, FieldNameQueryConverter<EnvelopeGeoShape>>))]
 		IGeoShapeQuery GeoShape { get; set; }
 
-		[JsonProperty(PropertyName = "common_terms")]
+		[JsonProperty(PropertyName = "common")]
 		[JsonConverter(typeof (FieldNameQueryConverter<CommonTermsQuery>))]
 		ICommonTermsQuery CommonTerms { get; set; }
 

src/Tests/Nest.Tests.Integration/Search/QueryDSLTests.cs

@@ -132,6 +132,21 @@ public void TestTermFacet()
 			Assert.Greater(results.FacetItems<TermItem>(f => f.Country).Count(), 0);
 		}
 
+		[Test]
+		public void TestCommonTerms()
+		{
+			var results = this.Client.Search<ElasticsearchProject>(s => s
+				.Query(q => q
+					.CommonTerms(t => t
+						.OnField(p => p.Name)
+						.Query("elasticsearch")
+					)
+				)
+			);
+
+			Assert.True(results.IsValid);
+			Assert.Greater(results.Hits.Count(), 0);
+		}
 
 		[Test]
 		public void TermSuggest()