The free plugin, which can be downloaded from Adobe's site, will make it simple for Aperture users to migrate their libraries into Lightroom, a task that takes quite a bit of time to do manually. It is available only for Mac users and requires Lightroom 5.6 or later.
Using the plugin, Aperture users can import the following data into Lightroom: Flags, Star Ratings, Keywords, GPS Data, Rejects, Hidden Files, Color Labels, Stacks, and Face Tags. Color Labels, Stacks, and Face Tags are imported as Lightroom keywords, and because adjustments to photos made in Aperture can't be read into Lightroom, the tool will import both original images and copies of images with adjustments applied.
This plugin should make life considerably easier for those wanting to migrate from Aperture (which has been discontinued by Apple) to Adobe's Lightroom. Keep in mind that this plugin does require a subscription to Adobe's Creative Cloud, which starts at $9.99.