Mac spotlight can’t find apps – disable and enable spotlight

More info here,

# First, turn off Spotlight:
sudo mdutil -a -i off

# Next, unload the metadata file that controls Spotlight’s index:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist

# The following command re-loads the index:
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist

# Finally, turn Spotlight back on:
sudo mdutil -a -i on