Easily the best search plugin out there (Paid or Free)!

This plugin is very simple to use out of the box and extremely customizable (just modify functions.php) with a huge knowledgebase on the developer’s website/wordpress forums to find the custom code you need. If for some odd reason you can’t find the answer, the author is awesome and responsive on the forums since he checks about once every weekday.

I highly recommend this for any WordPress site or Woocommerce store! It’s a super lightweight plugin that does not affect your load speed and runs efficiently.