fixed failing unit tests after splitting specialfields into interfaces

Author: Mpdreamz

src/Tests/Nest.Tests.Unit/Core/Map/SourceField/SourceFieldSerializesFully.json

@@ -3,7 +3,7 @@
     "_source": {
       "enabled": false,
       "compress": true,
-      "compress_treshold": "200b",
+      "compress_threshold": "200b",
       "includes": [
         "path2.*"
       ],

src/Tests/Nest.Tests.Unit/Core/Map/TimestampField/TimestampFieldTests.cs

@@ -13,7 +13,7 @@ public void TimestampFieldUsingExpression()
 			var result = this._client.Map<ElasticsearchProject>(m => m
 				.TimestampField(a => a
 					.Path(p => p.Name)
-					.Enabled()
+					.Enabled(false)
 				)
 			);
 			this.JsonEquals(result.ConnectionStatus.Request, MethodInfo.GetCurrentMethod()); 

src/Tests/Nest.Tests.Unit/Core/Map/TtlField/TtlFieldTests.cs

@@ -12,7 +12,7 @@ public void TtlFieldSerializes()
 		{
 			var result = this._client.Map<ElasticsearchProject>(m => m
 				.TtlField(t => t
-					.Enable(false)
+					.Enable()
 					.Default("1d")
 				)
 			);