I have slowly collected a large (several million file) ebook library from open directories over the past few years. I am now trying to set up a search solution

I have slowly collected a large (several million file) ebook library from open directories over the past few years. I am now trying to set up a search solution for it. Recoll doesn't seem to work well headless, so I am taking a look at: https://github.com/ICIJ/datashare https://github.com/ICIJ/datashare which claims to be able to do some distributed indexing.