Koha::SearchEngine::QueryBuilder - instantiates the query builder that corresponds to the SearchEngine system preference
This allows you to be agnostic about what the search engine configuration is and just get whatever querybuilder you need.
use Koha::SearchEngine::QueryBuilder;
my $qb = Koha::SearchEngine::QueryBuilder->new({index => $Koha::SearchEngine::BIBLIOS_INDEX});
Creates a new QueryBuilder of whatever the relevant type is.