Disable testFailIfAlreadyExists for HdfsRepositoryTests

Author: kvanerum

plugins/repository-hdfs/src/test/java/org/elasticsearch/repositories/hdfs/HdfsRepositoryTests.java

@@ -62,4 +62,9 @@ protected void assertCleanupResponse(CleanupRepositoryResponse response, long by
             assertThat(response.result().blobs(), equalTo(0L));
         }
     }
+
+    @Override
+    public void testFailIfAlreadyExists() {
+        // HDFS does not implement failIfAlreadyExists correctly
+    }
 }