fix #372 do not touch DefaultIndex if its not neccessary while resolving index name

Author: Mpdreamz

src/Nest/Resolvers/IndexNameResolver.cs

@@ -1,13 +1,13 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Collections.Concurrent;
-using System.Reflection;
-
-namespace Nest.Resolvers
-{
-	public class IndexNameResolver
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Collections.Concurrent;
+using System.Reflection;
+
+namespace Nest.Resolvers
+{
+	public class IndexNameResolver
 	{
 		private readonly IConnectionSettings _connectionSettings;
 
@@ -25,14 +25,13 @@ public string GetIndexForType<T>()
 		public string GetIndexForType(Type type)
 		{
 			var defaultIndices = this._connectionSettings.DefaultIndices;
-			var defaultIndex = this._connectionSettings.DefaultIndex;
 
 			if (defaultIndices == null)
-				return defaultIndex;
+				return this._connectionSettings.DefaultIndex;
 			if (defaultIndices.ContainsKey(type) && !string.IsNullOrWhiteSpace(defaultIndices[type]))
 				return defaultIndices[type];
-			return defaultIndex;
-		}
-
-	}
-}
+			return this._connectionSettings.DefaultIndex;
+		}
+
+	}
+}