Enhancement:
When Reporting is done scrolling through searches to build the CSV export, it clears the scroll ID in Elasticsearch to free the memory. If Elasticsearch has lost context of the scroll_id for some reason, it will return a 404 response.
Currently, any error encountered in communications with Elasticsearch will cause the CSV job to fail. However, a 404 error that happens when trying to clear the scroll ID could possibly be safely ignored, as long as a warning message is logged about it.