How to Force Spotlight to Reindex a Drive

To reindex your root drive, follow these 5 commands.

sudo mdutil -i off /Volumes/your_hard_drive_name_1 
sudo mdutil -E /Volumes/your_hard_drive_name_1 
cd / 
sudo rm -fr .Spotlight-V100 
sudo mdutil -i on /Volumes/your_hard_drive_name_1 

To determine the size of your Spotlight databases seeĀ https://ucsd-igpp.atlassian.net/wiki/x/mbpt