Platform for search builder / indexer website load external database

I made a search form on my website, that displays search results from my pages. Right now I am using "Search maker pro" software that index my pages, and works with java. The problem is that I want something much better, for 2021 year. I am looking something similar, but to save and load my search results from an external database platform, with php, java, etc

So, can anyone tell me if there exist a platform for search builder that can index my pages and load the search results from an external database?

Buy the way, I am not using wordpress, just html pages.