If it's the same release I don't see how it doesn't count as a dupe. There aren't enough slots on the front page to have a new thread each time software goes from RC to GA.
If HN users feel strongly about this we're always happy to make exceptions, but we see a lot of incremental release and status-change posts, and most don't count as substantive.
Jason from Elastic here. It wasn't the same release as there were critical changes[1] between the RC and the GA, and the RC release will receive no support.