How to Index and follow Search Results page

I have a unique need to allow search results pages to be indexed on this eCommerce store (URL supplied).

I am using Yoast and I notice the following in view-source when I visit ?s=CATEGORY&post_type=product&title=1&orderby=title

<meta name='robots' content='noindex, follow' />

Any code you can provide that can allow search results pages to be indexed and followed (ONLY where the search string includes this &post_type=product&title=1&orderby=title )?