I have a user I've been trying to help that had used Time Machine to restore some folders and files from an older Mac onto MacOS Sierra. When I initially saw this user's system, he had the classic issue of a privilege for a user that was just saying "Loading..."
But then, a week later, after Apple ran some diagnostics, I took a look and NOW that user showed up as _spotlight, set to Read Only. For example, the image below shows the privileges for a folder our application creates in the user's Documents folder:
I've never seen _spotlight, but I assume this must have the same user ID as whatever user he tried to restore from his other Mac's Time Machine backup?
I realize in this particular case, the older "repair permissions" would;t have affected our app's folder, but since Apple's removed Repair Permissions from Disk Utility, I'm guessing they believe there's no longer any likelihood of permissions issues?
Has anyone ever seen _spotlight show up like this? Seems benign, but removing it would also seem harmless, too.