Registering module in 2.4

Hi

I am trying to adjust the Xapian plugin to the very recent massive changes.

https://github.com/grosjo/fts-xapian

I implemented the changes about the settings

However, I get to :

Feb 16 13:39:44 gjserver dovecot[2211311]: imap(xxx)<2211361><W21YikIuomA2rj7G>: Error: fts: Failed to initialize backend 'xapian': Unknown backend

Has the module registration changed as well ?

Thank you so much