Spotlight won't index any of the standard built-in macOS apps. It *does* index all the 3rd-party apps. Any suggestions?
Back in 2019 I had a client whose Spotlight wouldn't index fully. We ran Etre Check on his machine and got back some info from mds, reporting that mdimporter was crashing, and it gave us a file id.
I had him open up a terminal and put in sudo mdutil -t &lt;number&gt;. It came back with a path to an email. I had him open up that email (with open &lt;path&gt;), he reviewed the email, decided he didn't need it and deleted it.
IIRC we had to repeat the process multiple times until mdimporter stopped choking on his files. Not sure what kind of bug we tripped, but after deleting maybe file of his files, his system indexed properly.
Start here and see if this shows anything related to Spotlight, mds, or mdimport.
Etre Check