I am running Nifi 1.9.2 on a two-node cluster and it seems that I am losing data occasionally when I restart Nifi. I am seeing multiple instances of the following error (each error is for a different swap file)   2021-03-25 19:29:46,426 WARN [main] o.a.n.controller.FileSystemSwapManager Encountered unknown Swap File ./flowfile_repository/swap/1616081663634-7cde3c5c-016b-1000-0000-00004c82c4b2-98e280b7-c8e5-44d5-a94d-804cbde11f91.local.swap; will ignore this Swap File. This file should be cleaned up manually   and when I check the output of Nifi, I am seeing less data than expected around the time of the restart.   It seems to me that Nifi is swapping files but is unable to update the WriteAheadLog before Nifi is stopped. So, when Nifi starts again, it is unable to get the swapped files because there is no record of them in the WriteAheadLog. Let me know if this conclusion is correct and if so, how I can prevent this issue from occurring in the future. ... View more