Luca Cavanna e3fc1638d8 Improve error handling in async search code (#57925)
- The exception that we caught when failing to schedule a thread was incorrect.
- We may have failures when reducing the response before returning it, which were not handled correctly and may have caused get or submit async search task to not be properly unregistered from the task manager
- when the completion listener onFailure method is invoked, the search task has to be unregistered. Not doing so may cause the search task to be stuck in the task manager although it has completed.

Closes #58995
2020-07-03 16:07:26 +02:00
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