Elasticsearch active (exited)

[Itaasi]

Hey

I'm having some trouble with our Nagios Log Server.
About once a day elasticsearch enters the active (exited) state.
Since the first time it happened, issuing the status command for elasticsearch is shown as in the attached picture.

I have also attache an excerpt of the elasticsearch log displaying more details, that might pertain to the error.

What can cause this issue?

[scottwilkerson]

How much free space is available of the disks of each of the instances in the Log Server cluster?

The above can been seen if there is over 80% usage.