[ES6 upgrade ES7] The two-node cluster works normally, but the master node fails, the slave node tries to reconnect, and does not recommend itself as the new master node

Elastic Stack Elasticsearch
6

关停master节点，master节点堆栈信息：
[2019-10-30T10:24:06,092][INFO ][o.e.n.Node ] [node_20.23.72.14] stopping ...
[2019-10-30T10:24:06,541][INFO ][o.e.n.Node ] [node_20.23.72.14] stopped
[2019-10-30T10:24:06,542][INFO ][o.e.n.Node ] [node_20.23.72.14] closing ...
[2019-10-30T10:24:06,552][INFO ][o.e.n.Node ] [node_20.23.72.14] closed