I don’t know them specifically, when I want to use something quick I use FacetWP. When I have the time I build all the code required for the search myself, which is based on the first link I posted, the Dynamic $_GET parameters section of https://www.advancedcustomfields.com/resources/query-posts-custom-fields/. As far as I know there are no “free” plugins that will do searches based on ACF field types, or I should say, they will work on the “Basic” field types, but not on any of the more complicated ones.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users