Elastic has identified a bug in Fleet Server versions 9.5.3 and 9.4.6 that causes Elastic Agents to crash-loop and go offline when Fleet pushes configuration updates. The issue affects only policies configured to use Fleet's remote Elasticsearch output feature and impacts agent enrollment and check-in operations. The current status is identified.
Elastic develops observability and search software used by enterprises for logging, metrics, and analytics across distributed systems.
Elastic recommends that users of Fleet's remote Elasticsearch output avoid upgrading to versions 9.5.3 or 9.4.6 until a fix becomes available. Customers already running affected versions experiencing agent check-in failures should contact Elastic Support for remediation steps. A fix has been merged and will ship in upcoming 9.5.x and 9.4.x releases, with issue tracking in fleet-server#7791 and elastic-agent#16542.
This is a developing story and will be updated as new information becomes available.