Search display templates not present on site collection

Scenario:
When you configure a Search Result via CA, you might see the following error in the Preview panel:

The Search display templates are not present on this site collection. To add them, you need to activate the "Search Server Web Parts and Templates" feature on the Site Collection Features page.

Solution:
Open up the SharePoint 2013 Management Shell as Administrator and run the following command:

Enable-SPFeature SearchWebParts -url http://central_admin_url