Richard.Taylor wrote:
Léonie,
Is your system library on an external disk? That is the only time you would get the new warning, I think. ...
My System Library is usually in my Pictures folder.
My tests have been with a small library, specifically created for testing.
The warning "This Library isn't searchable in Spotlight due to its location" appeared for the test library, when I moved it on the the internal drive to /Users/Shared, outside my user home folder, but still on the internal drive in the /Users area. I did not expect Photos to be able to work with a library in the folder /Users/Shared - as a shared folder does not suffice to give read/write permissions to the internal files in the Photos Library package, at least it has been the case in the previous system versions, so I am not surprised that the warning in the Settings panel changed in this folder to "This Library isn't searchable in Spotlight due to its location". It could have been more specific, however.
I cannot test to move the system Photos Library to a different volume, as my system Photos Library is an iCloud Library. Switching the System Photos Library to a moved library will disable iCloud Photos and I would have to endure a week of a new iCloud Syncing once I moved it back to the Pictures folder.