It's odd. The Indonesian selection screen says "unique Luxury Resources". If it were a new resource, and it was one that only Indonesia gets, and Indonesia always gets it, then wouldn't the UA description name the resource?
I'm starting to think that Indonesia gets up to 6 copies of some regular luxury that isn't on the map for that particular game. It can't be 6 different luxuries, because on huge maps almost all the luxuries are in play.
The unique Ability is spice islanders though, I'd count that as mentioning a resource (it'd be silly if the spice islands UA was really the copper islands, right?)