Spotlight keeps losing index since Sonoma
I use either Spotlight or Alfred (which just uses the Spotlight index) to search for files on a 14" Macbook Pro M1, 16GB 2TB. Since upgrading to Sonoma, search returned no results.
(if relevant: the firmware had to be reloaded by the store, the disk wiped, Sonoma installed and everything migrated back by choosing the Carbon Copy Cloner backup drive from the latest Ventura backup. The App Store (and perhaps other apps) did not notice that the system was now Sonoma (I forgot how I saw this, but it offered me strange updates), so I downloaded and installed Sonoma via the App Store once more just to make sure that everything is up to date.)
I now have the following settings and steps:
System Settings > Siri & Spotlight >
Search Results: all boxes are checked.
Spotlight Privacy: No Locations Added.
I have added and removed the hard drive twice in Spotlight Privacy to force reindexing.
I have once deleted .Spotlight-V100 Folder via Alfred's Advanced Preferences Rebuild macOS Metadata https://www.alfredapp.com/help/troubleshooting/indexing/.
Each time, reindexing completed within a reasonable amount of time as monitored via the progress bar underneath the spotlight search window when evoked from the menu bar, and search worked fine for a while.
This morning again, no search results, neither via Spotlight nor via Alfred. I cannot even find a specific pdf in a specific folder when I copypaste the file name into spotlight nor Alfred.
I don't know how to check the indexing status on macOS, but Alfred's File Search Troubleshooting report for a sample pdf gives some extra hints that the files aren't even indexed:
Check if volume '/' is indexed by macOS...
⚠️ Indexing may not be enabled on this drive
/:
Error: unknown indexing state.
-----------------------------------------------------------
Check direct file metadata...
⚠️ Direct metadata is missing, this file is likely not indexed by macOS
-----------------------------------------------------------
Check mdls file metadata...
❌ macOS metadata missing essential items
/Users/homefolder/xxx/xxx/xxx/xxx.pdf: could not find /Users/homefolder/xxx/xxx/xxx/xxx.pdf.
Note that this is not about Alfred, it is just more information about Spotlight that Alfred displays to me.
What else could I try to make spotlight keep its index?
MacBook Pro (2021)