Increase replica_unassigned_buffer_time default from 3s to 5s #112834
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#112066 changed the way we calculate if all replicas are unassigned when primary is recently created, specifically on serverless. That PR included a new setting,
health.shards_availability.replica_unassigned_buffer_time, with a default value of 3 seconds. This PR increases the default value to 5 seconds as it will keep more shards from going red transiently, while still being low enough to go red quickly if there is an actual availability issue.