@vincentdenkspel Are you talking about "Advanced Search 4"? I am using this one for filtering. In general I get your point.
I wonder how many people are using ES now? I believe we would need a lot of investments to make this project really succesfull. Not only the coding part, but also the documentation & support... I just don't see the guy, who will do that. Cause as far as I can see ES is not something any random developer can do. You really need a quality coder for that. And as I stated above, IMO its better, if the best coder focus on topics, which are important for the majority of users.
Have you looked at services like doofinder or algolia? For example doofinder offers a free ps module and 30 days of free testing.