Elasticsearch Watcher Stops processing after recovering from full disk

3 times now I've managed to fill up my disks and after recovering the watcher service fails to work reliably. I end up having to restart each data node then it works fine. This isn't just my watches, but the system watches as well. I've tried stopping the service with
POST _xpack/watcher/_stop
followed by a start
POST _xpack/watcher/_start

it starts erroring right away on the console.
[2018-09-04T22:55:07,503][WARN ][o.e.x.w.e.ExecutionService] [myhost] failed to execute watch [322e52YFQ16I7v2vd9B8kQ_logstash_version_mismatch]
I've not seen any reason for it.
This was just one example.

This can be deleted,

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