I see in your demos that some search engines have image thumbnails in the results. How can I add images to my search results?
Swiftbot recently learned how to intelligently detect and index the featured image of your page content, but it’s still possible to manually define a result thumbnail by using custom meta tags within the page’s HTML:
<meta class='swiftype' name='image' data-type='enum' content='[image url]' />
Once you’ve added the image meta tag to your page(s), you’ll want to recrawl your site to pick up the changes.
You can read more about this process in this tutorial.