ElasticSearch (4) cluster -- sharding test

jingjihui

　　  
　　cluster setting 
　　shards : 5
　　replica : 0
　　
　　There are 3 ES nodes.
　　NODE_1 master
　　NODE_2
　　NODE_3
　　After some indices are completed, using the segment api we can see that there are 5 primary active shards.
　　NODE_1 (master)  shard1, shard2
　　NODE_2           shard3
　　NODE_3           shard4, shard5
　　
　　Then master node service is shutdown(kill process directly), using the segment api we can see that there are 3 primary active shards.
　　NODE_2  (master)         shard3
　　NODE_3           shard4, shard5  
　　
　　Then bring back the NODE_1,  using the segment api we can see that there are 5 primary active shards.
　　NODE_1           shard1, shard2
　　NODE_2  (master)         shard3
　　NODE_3           shard4, shard5  
　　It means the index segments can be brought back after the ES service is back.
　　But with replica 0 , is it possible to copy the sharding to other nodes?
　　Even using the shutdown service rest api, the shard is not available after node is shutdown.
　　Wrapper service is necesary to use if you want to restart the ES service using rest api.
　　Every time a node is restarted, the node id changes.