Caused by: java.lang.IllegalStateException: failed to obtain node locks, tri

我的情况是生产环境中，elasticsearch突然崩溃，然后起不来了。
我的日志目录在

vim /var/log/elasticsearch/my-elk-cluster.log

日志信息为Caused by: java.lang.IllegalStateException: failed to obtain node locks, tried [[/data/elk_data/my-elk-cluster]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [1])?
解决方法为，找到配置文件，我的目录是

vim /var/log/elasticsearch/my-elk-cluster.log

添加下面代码到配置文件

node.max_local_storage_nodes: 2

然后就可以启动成功了。