Yes, but that does not replicate the view and configuration. What about custom fields? How does that work with indexer? And how do they sync?

The advantage of integrated solutions is that you have less work to replicate your workspace on a new device, often even no work at all. How well does that work with indexer? Spotlight does not even work indepedant of the platform, tracker is Gnome-ware, does it integrate with KDE or Non-KDE?