Add test for conditionless match query

Author: gmarz

src/Tests/Nest.Tests.Unit/Nest.Tests.Unit.csproj

@@ -765,6 +765,9 @@
     <None Include="Reproduce\Issue579.json">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <None Include="Reproduce\Issue876.json">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
     <None Include="Search\Fields\FixedCovariantSearchResult.json">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>

src/Tests/Nest.Tests.Unit/Search/Query/Modes/ConditionlessQueryJson.cs

@@ -7,7 +7,7 @@ namespace Nest.Tests.Unit.Search.Query.Singles
 	public class ConditionlessQueryJson
 	{
 		[Test]
-		public void Fallback()
+		public void FallbackTerm()
 		{
 			var s = new SearchDescriptor<ElasticsearchProject>().From(0).Size(10)
 				.Query(q=>q
@@ -29,6 +29,40 @@ public void Fallback()
 			Assert.True(json.JsonEquals(expected), json);		
 		}
 
+		[Test]
+		public void FallbackMatch()
+		{
+			var s = new SearchDescriptor<ElasticsearchProject>().From(0).Size(10)
+				.Query(q => q
+					.Conditionless(qs => qs
+						.Query(qcq => qcq
+							.Match(m => m
+								.OnField(p => p.Name)
+								.Query("")
+							)
+						)
+						.Fallback(qcf=>qcf
+							.Match(m => m
+								.OnField(p => p.Name)
+								.Query("do_me_instead")
+							)
+						)
+					)
+				);
+
+			var json = TestElasticClient.Serialize(s);
+			var expected = @"{ from: 0, size: 10, 
+				query : {
+						match : { 
+							name : {
+								query: ""do_me_instead""
+							}
+						}
+					}
+			}";
+			Assert.True(json.JsonEquals(expected), json);
+		}
+
 		[Test]
 		public void UseQuery()
 		{