Need to flush only one IPSec tunnel, not all of them

Greetings from Wisconsin,

On several different client Mikrotik firewalls that we manage, the clients themselves have multiple sites connected via IPSec site-to-site VPN. Sometimes one remote site goes down, and our IPWatcher script performs a “/ip ipsec installed-sa flush” which flushes all the tunnels, not just one. What command can be used to flush only a specified tunnel, instead of flushing all of them?

Thank you in advance,
Isaac Grover