You may want to have a look into the tuning section:
https://docs.zammad.org/en/latest/appendix/configure-env-vars.html
And while you’re at it, as your configuration looks off compared to our suggestion, also have a look at our database configuration guide:
https://docs.zammad.org/en/latest/appendix/configure-database-server.html
Have a look into your elasticsearch log file.
The reasons for elasticsearch crashing or not starting can be various.
Nobodoy can help you at that point. The Elasticsearch community may be the better sparring partner on that regard.