Disable Spotlight Search
Open Terminal (you can find it under Applications > Utilities)
Copy this:
sudo mdutil -E /
Paste in Terminal
Hit Enter
Type computer password
Wait…☕️
Enable Spotlight Search (aka Re-Index Spotlight)
Copy this:
sudo mdutil -a -i on
Paste in Terminal
Hit Enter
Type computer password
Wait…
Open Mail and go WOOOOOOOOOOOOOOOO! Cuz search is back baby! ?