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ac94253dce
In previous work, we refactored the delay mechanism in index shard operation permits to allow for async delaying of acquisition. This refactoring made explicit when permit acquisition is disabled whereas previously we were relying on an implicit condition, namely that all permits were acquired by the thread trying to delay acquisition. When using the implicit mechanism, we tried to acquire a permit and if this failed, we returned a null releasable as an indication that our operation should be queued. Yet, now we know when we are delayed and we should not even try to acquire a permit. If we try to acquire a permit and one is not available, we know that we are not delayed, and so acquisition should be successful. If it is not successful, something is deeply wrong. This commit takes advantage of this refactoring to simplify the internal implementation. Relates #24971