Do it from Terminal via sudo (info courtesy this page):

sudo mdutil -a -i off

You'll also need to supply your admin password.

Note: Set the items for Spotlight to show at Prefs > Spotlight

Do it from Terminal via sudo (info courtesy this page):

sudo mdutil -a -i off

You'll also need to supply your admin password.

Similarly, to turn back on:

sudo mdutil -a -i on

Note: Set the items for Spotlight to show at Prefs > Spotlight

Do it from Terminal via sudo (info courtesy this page):

sudo mdutil -a -i off

Note: Set the items for Spotlight to show at Prefs > Spotlight

Do it from Terminal via sudo (info courtesy this page):

sudo mdutil -a -i off

You'll also need to supply your admin password.

Note: Set the items for Spotlight to show at Prefs > Spotlight