They're #4 by population, and the world's most populous Muslim country, but are also only a quarter century removed from a corrupt authoritarian regime.

They have very little in the way of exported cultural products ("The Raid" films?), are much worse in sports than would be expected based on population, spend relatively little on their military and don't do much in the way of regional power projection, and are growing economically but not remarkably, so there just aren't that many avenues for them to make international news.

The only time I see Indonesia in the news is when some unfortunate soul gets swallowed by a giant snake:

https://www.cbsnews.com/news/python-kills-woman-swallowed-in...

Many such cases.