Elasticsearch masternode is not reponding

I am seeing this kind of behavior of our ES master node and it becomes unresponsive. I have checked in Kibana xpack Monitoring and I did not get the status (Screenshot attached)

Checked the master node log file, found below log entries -
[2018-07-15T19:59:14,903][ERROR][o.e.x.m.c.m.JobStatsCollector] [wkelknaples03-i-050e3ffa13b249d67-gpo] collector [job_stats] timed out when collecting data

I am stuck with this issue. If anyone can help.

Is that all there is in the log?

This is the only error level entry. Other information are related with index update and info level. This happened multiple time and this entry is always there.

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