Hydra Indexer pooled-executor bug

[zeeshanakram3]

On one of the production QN machines, the Hydra indexer crashed with the following error.

022-09-21T21:40:01.791Z index-builder:indexer Done block #2616857
2022-09-21T21:50:01.755Z index-builder:pooled-executor Error getting next generator value
2022-09-21T21:50:01.756Z index-builder:pooled-executor Generator is done, exiting
2022-09-21T21:50:01.756Z index-builder:pooled-executor Generator is done, exiting
2022-09-21T21:50:01.756Z index-builder:pooled-executor Generator is done, exiting
2022-09-21T21:50:01.756Z index-builder:pooled-executor Generator is done, exiting
2022-09-21T21:50:01.756Z index-builder:indexer Index builder has been stopped
2022-09-21T21:50:01.756Z index-builder:redis-factory Closing Redis connections
2022-09-21T21:50:01.757Z index-builder:indexer Index builder has been stopped
error Command failed with exit code 255.

Though, the initial assessment is that this happened because the machine's recourses were exhausted since the indexer started working fine after the reboot. However, this issue needs further investigation