Recommended postgres parameters for index creation with 244gb RAM and 32 CPUs?
This is on AWS Aurora, using postgres-10.6, in case that makes a difference.


Yes, this matters quite a lot.  Native parallel btree index builds were introduced in v11, so your "max_parallel_workers" setting won't matter for index builds under v10.

Unless you upgrade, you will have to parallelize them yourself by opening multiple sessions in parallel and building one index in each one.  You will probably want to lower "maintenance_work_mem" as well if you have parallel processes (either of the manual or the v11 variety) as each one can claim that much memory.