Luca Cavanna 8caf7d4ff8 Decouple BulkProcessor from ThreadPool (#26727)
Introduce minimal thread scheduler as a base class for `ThreadPool`. Such a class can be used from the `BulkProcessor` to schedule retries and the flush task. This allows to remove the `ThreadPool` dependency from `BulkProcessor`, which requires to provide settings that contain `node.name` and also needed log4j for logging. Instead, it needs now a `Scheduler` that is much lighter and gets automatically created and shut down on close.

Closes #26028
2017-10-25 10:30:23 +02:00
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