First, I hope they’re delivered safe.
Second, why would anyone in Fiji want to be on a UN peacekeeping mission in the MidEast? Were they drafted? If so, that’s what a One-World government would look like, because Fiji itself doesn’t need overseas forces. It’s manpower tribute, or an exchange for economic bribes.
They are serving as peacekeepers/observers on the Golan heights. They are supposed to prevent incidents on that disputed border. The same sort of people serve on the Israel-Lebanon border.
This is a noble effort, generally, but often politically compromised.
Many countries send units to these peacekeeping detachments. Some do it because they are compensated by the UN, so you could say they are benevolent mercenaries; others because it is good training; others because it satisfies their own humanitarian vision, or at least serves as good PR for their government and armed forces.
The Golan heights fighting involved non-ISIS rebels, so I think the odds are the Fijians will be released unharmed.