Hi,
Looks like ECE v2.12.4 was just released to deal to the log4j library updates in the system deployments etc.
Its not yet mentioned in Apache Log4j2 Remote Code Execution (RCE) Vulnerability - CVE-2021-44228 - ESA-2021-31 from what I can see..
but have a look at the ece docs Elastic Cloud Enterprise 2.12.4 | Elastic Cloud Enterprise Reference [2.12] | Elastic