[TEST] mute watcher test failure that is being tracked in elastic/x-pack-elasticsearch#1517

Original commit: elastic/x-pack-elasticsearch@a28b7ce3a5

plugin/src/test/java/org/elasticsearch/xpack/watcher/history/HistoryTemplateTransformMappingsTests.java

@@ -74,6 +74,7 @@ public class HistoryTemplateTransformMappingsTests extends AbstractWatcherIntegr
         return false; // remove security noise from this test
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/x-pack-elasticsearch/issues/1517")
     public void testTransformFields() throws Exception {
         String index = "the-index";
         String type = "the-type";