Resuming Interrupted Reindexing Process

We are reindexing an index with following attributes:

  • Size ~3TB
  • Ever increasing (new records are pumped at high volume during peak

Is there a clean way to resume an interrupted reindexing process?
Does elastic search provides a way to persist the scrolls? If we can use
the same scroll we can essentially resume again.
What are the impacts of keeping scrolls alive for very long durations?

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