Rebuild the Spotlight Index on the fly

If you’re having issues finding files on your Mac, then you can easily rebuild the Spotlight index for your Mac by typing the following command into the Terminal:

sudo mdutil -E

After you do that, you will notice, after a few minutes, that when  you click the Spotlight button in the menu bar, Spotlight will show that it is currently indexing your system.
rebuild index
By using the above command, this will index all drives, or you can specify a drive to be indexed by adding the drive name.

sudo mdutil -E /Volumes/DriveName

Disclaimer:
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