How many Rules can you have on indices? Are they shared with replicas?

On a premium plan you have 10,000 Rules maximum per index.

With a standard replica you can also have 10,000 Rules which don't add on to your 10,000 included for its primary.

With a virtual replica it shares the quota of 10,000 Rules with its primary so you can only have 10,000 Rules maximum between a primary index and its virtual replicas.