IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Breaking change across PQ versions prior to Logstash 6.3.0edit
If you are upgrading from Logstash 6.2.x or any earlier version (including 5.x) and have the persistent queue enabled, we strongly recommend that you drain or delete the persistent queue before you upgrade. See Upgrading with the Persistent Queue Enabled for information and instructions.