Have you tried Xapiand? (https://kronuz.io/Xapiand/ https://kronuz.io/Xapiand/). It's a Xapian-based search and storage engine written in C++! We've been using

Have you tried Xapiand? (https://kronuz.io/Xapiand/ https://kronuz.io/Xapiand/). It's a Xapian-based search and storage engine written in C++! We've been using it for a while in a number of projects and it's quite simple and reliable.