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Description
Fixes DAN-1223.
Uses a semaphore in Redis to prevent more than 6 workers at a time.
delays a task by 30 minutes if the semaphore cannot be acquired.
retries for a task are capped at 64.
Index attempt is marked as canceled in the DB if this occurs.
How Has This Been Tested?
[Describe the tests you ran to verify your changes]
Backporting (check the box to trigger backport action)
Note: You have to check that the action passes, otherwise resolve the conflicts manually and tag the patches.