Right now, if a file was moved / removed while baloo_file was not running
(a common use-case for those who have dualboot), there is no way baloo will
become aware of such change (apart from running balooctl check by hand).
There will be stale (if a file was removed) or invalid (pointing to non-existing file,
if a file was moved) index entries, they will pop up if user performs search, which is
frustrating. I suggest performing those checks on baloo_file startup.