Hmmm - the Indonesian Air Force (TNI-AU) isn't that big and most of it is deployed towards the South China Sea
The nearest air base to Australia is Hasanuddin at Unjung Pandang (Makassar) - and that's over 1200 kms from the nearest bit of Australia.
They don't have a major base in the eastern 2000 km of the country - thats like the USAF not having a base west of Wichita.........
Hardly a threat at all.............