Thank you. Here is what I get :
# service plesk-php72-fpm restart
Redirecting to /bin/systemctl restart plesk-php72-fpm.service
Job for plesk-php72-fpm.service failed because the control process exited with error code. See "systemctl status plesk-php72-fpm.service" and "journalctl -xe" for details.
# /bin/systemctl status plesk-php72-fpm.service -l
● plesk-php72-fpm.service - The PHP 7.2.2 FastCGI Process Manager
Loaded: loaded (/usr/lib/systemd/system/plesk-php72-fpm.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Thu 2018-02-22 23:50:21 CET; 1min 55s ago
Process: 23263 ExecStart=/opt/plesk/php/7.2/sbin/php-fpm --nodaemonize (code=exited, status=78)
Main PID: 23263 (code=exited, status=78)
Feb 22 23:50:21 s20801255 systemd[1]: Starting The PHP 7.2.2 FastCGI Process Manager...
Feb 22 23:50:21 s20801255 php-fpm[23263]: [22-Feb-2018 23:50:21] WARNING: Nothing matches the include pattern '/opt/plesk/php/7.2/etc/php-fpm.d/*.conf' from /opt/plesk/php/7.2/etc/php-fpm.conf at line 119.
Feb 22 23:50:21 s20801255 php-fpm[23263]: [22-Feb-2018 23:50:21] ERROR: No pool defined. at least one pool section must be specified in config file
Feb 22 23:50:21 s20801255 php-fpm[23263]: [22-Feb-2018 23:50:21] ERROR: failed to post process the configuration
Feb 22 23:50:21 s20801255 php-fpm[23263]: [22-Feb-2018 23:50:21] ERROR: FPM initialization failed
Feb 22 23:50:21 s20801255 systemd[1]: plesk-php72-fpm.service: main process exited, code=exited, status=78/n/a
Feb 22 23:50:21 s20801255 systemd[1]: Failed to start The PHP 7.2.2 FastCGI Process Manager.
Feb 22 23:50:21 s20801255 systemd[1]: Unit plesk-php72-fpm.service entered failed state.
Feb 22 23:50:21 s20801255 systemd[1]: plesk-php72-fpm.service failed.