In every other context that it's used in Civilization, "unique" means exclusive to the civilization. So I don't think there's any question that the "unique" Luxury resources provide by Indonesia's special ability are new, civilization-specific resources.
Whether there are one or six different resources is open to interpretation. I think it's most likely that either there are two different resources and each city gives you one of each, or there are three different resources, and each city gives you two of the same type. Six of the same resource would be underwhelming, and getting only one of six different resources would be a lot of Happiness but no opportunity for trading.
Whether there are one or six different resources is open to interpretation. I think it's most likely that either there are two different resources and each city gives you one of each, or there are three different resources, and each city gives you two of the same type. Six of the same resource would be underwhelming, and getting only one of six different resources would be a lot of Happiness but no opportunity for trading.