错误现象：
es 服务启动后日志报错如下：
```
2017/12/23 下午1:45:05[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
2017/12/23 下午1:45:05[2017-12-23T05:41:49,242][INFO ][o.e.n.Node ] [eMPJsvt] stopping ...
2017/12/23 下午1:45:05[2017-12-23T05:41:49,291][INFO ][o.e.n.Node ] [eMPJsvt] stopped
2017/12/23 下午1:45:05[2017-12-23T05:41:49,291][INFO ][o.e.n.Node ] [eMPJsvt] closing ...
2017/12/23 下午1:45:05[2017-12-23T05:41:49,336][INFO ][o.e.n.Node ] [eMPJsvt] closed
2017/12/23 下午1:45:05[2017-12-23T05:42:20,245][INFO ][o.e.n.Node ] [] initializing
### 解决办法：
sysctl -w vm.max_map_count=262144
