elastic search扩容时，在新扩容的服务去器中elas

1.错误信息：

[JBS2] failed to send join request to master [{JBS1}{Aikf0UoaTZ-mo4-rcjQ72w}{f93aZTXeQhiAEWpKGlKzYA}{192.168.127.121}{192.168.127.121:9300}], reason [RemoteTransportException[[JBS1][192.168.127.121:9300][internal:discovery/zen/join]]; nested: IllegalArgumentException[can't add node {JBS2}{Aikf0UoaTZ-mo4-rcjQ72w}{Ms-juBxTQoyZd_q_BlMdSw}{192.168.127.122}{192.168.127.122:9300}, found existing node {JBS1}{Aikf0UoaTZ-mo4-rcjQ72w}{f93aZTXeQhiAEWpKGlKzYA}{192.168.127.121}{192.168.127.121:9300} with the same id but is a different node instance]; ]

2.错误原因是：当我从bigdata121中将elasticsearch发送到bigdata122，bigdata123之后，在elasticsearch下中的data目录中已经存在node节点了，因此将data中的内容删除之后，再启动就可以了