Github user rmetzger commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3112#discussion_r95973065
  
    --- Diff: 
flink-connectors/flink-connector-elasticsearch5/src/main/java/org/apache/flink/streaming/connectors/elasticsearch5/ElasticsearchClientFactoryImpl.java
 ---
    @@ -0,0 +1,88 @@
    +/*
    + * 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
    + *
    + *    http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * 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.flink.streaming.connectors.elasticsearch5;
    +
    +import 
org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchClientFactory;
    +import 
org.apache.flink.streaming.connectors.elasticsearch.util.ElasticsearchUtils;
    +import org.apache.flink.util.Preconditions;
    +import org.elasticsearch.client.Client;
    +import org.elasticsearch.client.transport.TransportClient;
    +import org.elasticsearch.common.network.NetworkModule;
    +import org.elasticsearch.common.settings.Settings;
    +import org.elasticsearch.common.transport.TransportAddress;
    +import org.elasticsearch.transport.Netty3Plugin;
    +import org.elasticsearch.transport.client.PreBuiltTransportClient;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.net.InetSocketAddress;
    +import java.util.List;
    +import java.util.Map;
    +
    +/**
    + * Concrete implementation of {@link ElasticsearchClientFactory} for 
Elasticsearch version 5.x.
    + *
    + * Flink Elasticsearch Sink for versions 5.x uses a {@link 
TransportClient} for communication with an Elasticsearch cluster.
    + */
    +class ElasticsearchClientFactoryImpl implements ElasticsearchClientFactory 
{
    +
    +   private static final long serialVersionUID = -7185607275081428567L;
    +
    +   private static final Logger LOG = 
LoggerFactory.getLogger(ElasticsearchClientFactoryImpl.class);
    +
    +   /**
    +    *      User-provided transport addresses.
    +    *
    +    *      We are using {@link InetSocketAddress} because {@link 
TransportAddress} is not serializable in Elasticsearch 5.x.
    --- End diff --
    
    Tab indentation


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