kezhenxu94 commented on a change in pull request #3803: Add elasticsearch 6.x 
plugin & elasticsearch 6.x test scenario

 File path: 
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+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+package org.apache.skywalking.apm.plugin.elasticsearch.v6;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+ * @author aderm
+ */
+public class RemotePeerCache {
+    private List<String> remotePeerList = Collections.synchronizedList(new 
 Review comment:
   > Yes, I was thinking about future expansion of the function.
   add it when you really need it, unused codes simply confuse others

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