Abort from paused state causes job to be deleted under some conditions

Last night, I paused a file system job that was indexing into Solr. This morning, before starting Solr, I aborted the job, and waited for it to enter the "End notification" phase. Then, I started Solr. The job entered the "Cleaning up" phase, and deleted itself.

Looking at the history, it appears that the notification phase had an error, which may have been the trigger for this unwelcome behavior.