We have a variant of Expertrec for that. you can read more here. https://blog.expertrec.com/how-to-create-an-unlimited-ad-free-custom-search-for-large-websites

We have a variant of Expertrec for that. you can read more here. https://blog.expertrec.com/how-to-create-an-unlimited-ad-free-custom-search-for-large-websites/ https://blog.expertrec.com/how-to-create-an-unlimited-ad-fre... We are planning to go with shared indexes for these large websites to keep the cost low, so no control on ranking.