1. Launch a new File Explorer window
  2. Navigate to C:\Users\<your name>\Google Drive\   (Note it won’t work if you do this on the Favorites or Desktop shortcut)
  3. Right click 'Google Drive' and choose Properties
  4. Security tab > Advanced > Click your username (mine showed <not inherited>) > Click 'Change Permissions' > Check the 'Include inheritable permissions  -  or with Windows 10 - 'Enable inheritance' on the bottom left corner. After pressing 'ok' go back to indexing options and add the Google Drive folder (again, not the shortcut, but from the Users folder)