Salut,
There is a related thread with some suggestions here, and a link to another thread with some common Elasticsearch troubleshooting suggestions:
It's always a good idea to check the webserver logs when encountering a 500 error, for more information. See:
Let us know what you find, what you've tried from the above linked thread, and what worked and didn't work. Additionally, if the above thread does not help to resolve this issue, please let us know more about your AtoM installation, such as:
- The full version number listed in Admin > settings (or available via the command-line using php symfony tools:get-version)
- If you've followed the recommended installation instructions - and if not exactly, then what changes you have made
- What you found in the webserver error logs
- Anything else you think might help us help you
Cheers,