I've tried a few differnt terminal commands posted in various places, but THIS one worked for me (Mac Mini 2013, Paragon NTFS driver v9.5, External Seagate NTFS drive):
Go to Applications - Utilities - Terminal
Type in:
/usr/bin/mdutil -i on /Volumes/NTFS_DRIVE
(Enter)
/usr/bin/mdimport /Volumes/NTFS_DRIVE
(Enter)
Where NTFS_DRIVE is the name of your NTFS external drive. Put quotes before and after the drive name if your drive name has spaces in it.