The ability to be able to automatically update an index field of a document went the document has gone through a workflow, errors out, and you manually stop the workflow. We have a customer that scans so many invoices that if there is an error in one of the workflows, we could get 25 failed tasks before the error is updated. And then, they have to manually stop all of those workflows and resubmit the invoice, creating duplicate entries. But if when the workflow was stopped, an index field could be updated, we could use a deletion policy to delete all entries with a "stopped" index entry. Either this or the ability to push error documents through an updated workflow version instead of retrying it in the same workflow version the error took place.