On Debian 10, I just now ran an update which upgraded our ELK stack from 7.10 to 7.11. Prior to the upgrade, our system had been using approximately 2-3GB or RAM. Immediately upon reboot after the upgrade, we are noticing this system using approximately 13GB of RAM.
While other updates were also applied, htop seems to indicate majority (13GB out of 13.8GB) is being used by /usr/share/elasticsearch/jdk/bin/java so I suspect the culprit is elasticsearch.
I spun this server up within the last 6 months so it's a relatively fresh install with >20GB of indexes. It is a single node system with the full stack running on it (but only running ELK). I'm curious if anyone else has experienced this when upgrading from 7.10 to 7.11. Any other thoughts on what's going on?