A lot more than a decade. I've been using it for 15 years at it was a very mature project even then. Repo history goes back to 1999 and according to the history

A lot more than a decade. I've been using it for 15 years at it was a very mature project even then. Repo history goes back to 1999 and according to the history page the project's roots go back to the 80s. A bit like Postgres in this respect. https://xapian.org/history https://xapian.org/history https://sigir.org/files/forum/S2000/MUSCAT_note.pdf https://sigir.org/files/forum/S2000/MUSCAT_note.pdf