Open Finder and go to Applications - Utilities - Terminal and type the following commands (Press Enter after typing each command).
sudo mdutil -i off /System/Volumes/Data
sudo mdutil -i on /System/Volumes/Data
Note: When prompted for a password, please type the Mac user password. This would be invisible. Please type the same and hit enter.
Once done, restart the mac computer.
Checking Indexing Status open Spotlight ( cmd + space ) type indexing:
If this does not work:
Open Finder and go to Applications - Utilities - Terminal and type the following commands (Press Enter after typing each command).
sudo mdutil -a -i off
sudo mdutil -a -i on
sudo mdutil -X /System/Volumes/Preboot
Note: When prompted for a password, please type the Mac user password. This would be invisible. Please type the same and hit enter.