Dezi now supports a Xapian backend via Search::OpenSearch::Engine::Xapian.
You need only configure your Dezi server to use the Xapian backend like this in your dezi-config file:
{
engine_config => {
'type' => 'Xapian',
'index' => ['dezi-xapian.index'],
},
}
See the tutorial for more details.