Fail2ban has a build-in tool for testing the fail2ban filters, called fail2ban-regex, which you can use via command line. Like:

fail2ban-regex /var/www/vhosts/<your domain>/logs/access_ssl_log /etc/fail2ban/filter.d/apache-badbots.conf

Which uses the /var/www/vhosts/<your domain>/logs/access_ssl_log log as a source to test the Apache Bad bots filter located at /etc/fail2ban/filter.d/apache-badbots.conf. (Replace <your domain> with a domain on the server).

If you want to change/improve your fail2ban filters I higly recommend this blog post by @Peter Debik.

How to Avoid High CPU Load & Block Bad Bots with Plesk - Plesk