Fortigate How to reboot only secondary firewall in HA cluster

Note: your spare may be 1 instead of 0.

FIREWALL1NAME # execute ha manage 0 admin
Warning: Permanently added '169.254.0.1' (ED25519) to the list of known hosts.
[email protected]'s password:
FIREWALL1NAME  # execute reboot
This operation will reboot the system !
Do you want to continue? (y/n)y