max_map_count - minimal value for ElasticSearch and OpenSearch

You may have to increase the value of max_map_count on Docker host :

sudo sysctl -w vm.max_map_count=262144
# edit /etc/sysctl.conf to make it permanent

New requirments?

https://kaapana.readthedocs.io/en/latest/faq/too_many_files_open.html

sudo sysctl -w fs.inotify.max_user_watches=10000
sudo sysctl -w fs.inotify.max_user_instances=10000