I think "up to a million" is pretty damned bad. If that's the best you can do.....
FWIW, I had a friend in college who is Indonesian of Chinese descent. He remembers being hidden under the floorboards of his house several times, when his parents thought Suharto's thugs were coming.
They were lucky enough to be quite wealthy, and survived because they lived in a walled compound, and had a well-armed private army to protect them.
A hell of a lot of other folks weren't so lucky. They weren't communists, but they were Chinese.
Forgive me for my ignorance, but why was Suharto targeting the ethnic Chinese? Were they grouped with the Communists?