The baloo_file error seems to have disappeared for me for now. I restarted manually with balooctl enable which worked initially, but then would eventually dump again. I also noticed I had a kdeinit5[103503]: inotify_add_watch(/boot/efi) failed: (Permission denied) entry just before, and changed fs.inotify.max_user_watches=204800 in /etc/sysctl.d/50-max-user-watches.conf as noted here Inotify_add_watch Permission denied.