IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
IMPORTANT: This documentation is no longer updated. Refer to Elastic's version policy and the latest documentation.
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 Draining the queue for information and instructions.