I just came across the issue, that I added a new category in Vault in our test system.
I mapped UDP A to this new category. UDP A requires a value by default.
For this new category I do not want to require a value, so I override the setting for the new category. This causes a compliance check for all files and items of categories which have UDP A assigned.
When I did this, I only had one file which was assigned to the new category, yet Vault will now index for several hours.
I would be sufficient and helpful, if only files of the new category would be checked again for compliance, as the other categories did not change at all.