What should be the value of druid.indexer.fork.property.druid.processing.numThreads?

I know what ‍‍‍druid.processing.numThreads‍ is, but what should be the value of it for the tasks? Which is druid.indexer.fork.property.druid.processing.numThreads ? The one used by spawned peons. Because each peon normally uses one core and a specified amount of MEM.‍

The docs recommend (number of cores - 1).

The docs recommend 1 or 2.

I apologize because that’s not meant to sound rote. I’m wondering if you’ve already tried this and didn’t get the results you were after?