Plug-in displays all post in search box in auto suggest way. you only have to create a post and that post title will be suggest like Facebook do in search field. that plug-in will get image from the post, so it is not necessary to use featured image section.
Another benefit of that plug-in like you have title "Jhon Xavior" then you can find it with keyword "Jhon" or "Xavior" .That plug-in starts working with default WordPress search box. Click here to see feedback and ratings