lamber-ken commented on issue #7387: [FLINK-11235] fix thread lack when 
elasticsearch transport client init failed
URL: https://github.com/apache/flink/pull/7387#issuecomment-450656267
 
 
   here is a reproducible example
   ```
   StreamExecutionEnvironment env = 
StreamExecutionEnvironment.getExecutionEnvironment();
   env.enableCheckpointing(5000L);
   
   // env.setRestartStrategy(RestartStrategies.fixedDelayRestart(10000, 600L));
   
   DataStreamSource<String> source = env.addSource(new SourceFunction<String>() 
{
       @Override
       public void run(SourceContext<String> ctx) throws Exception {
           for (int i = 0; i < 100000000; i++) {
               Thread.sleep(1000);
               ctx.collect("data " + i);
           }
       }
   
       @Override
       public void cancel() {
   
       }
   });
   
   
   Map<String, String> config = new HashMap<>();
   config.put("cluster.name", "elasticsearch");
   config.put("bulk.flush.max.actions", "3");
   
   List<InetSocketAddress> transportAddresses = new ArrayList<>();
   transportAddresses.add(new 
InetSocketAddress(InetAddress.getByName("127.0.0.1"), 9700));
   
   ElasticsearchSink<String> essink = new ElasticsearchSink<>(config, 
transportAddresses, new ElasticsearchSinkFunction<String>() {
       @Override
       public void process(String element, RuntimeContext ctx, RequestIndexer 
indexer) {
           HashMap<String, String> data = Maps.newHashMap();
           data.put("key", element);
           
indexer.add(Requests.indexRequest().index("index").type("type").source(data));
   
       }
   });
   
   source.addSink(essink);
   env.execute();
   ```

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