On compute-heavy machines, Indexima will leverage the CPUs by opening and reading many files simultaneously. This can cause crashes if you didn't set enough authorized file descriptor for the user.
To increase the max number of open files on a Linux machine, you must open the file usually located in /etc/security/limits.conf and add the following line
* - nofile 65536
You can check that the change has been taken into account with the command
If you are starting Indexima with systemd, you need to add this line to your indexima.service file, under the [Service] block