add_filter('relevanssi_hits_filter', 'relevanssi_read_categories');
function relevanssi_read_categories($hits) {
    global $relevanssi_search_categories;
    global $relevanssi_search_terms;

        $temp_relevanssi_search_categories = array();
        $temp_relevanssi_search_terms = array();

    foreach ($hits[0] as $hit) {
        $cats = get_the_category($hit->ID);
                foreach ($cats as $cat) {
                        $temp_relevanssi_search_categories[$cat->name] = get_category_link($cat->term_id);

                }
        $terms = get_the_terms($hit->ID, 'custom_tax_here');
                foreach ($terms as $term){
                        $temp_relevanssi_search_terms[$term->name] = get_term_link($term->term_id, 'custom_tax_here');
                }
    }


    ksort($temp_relevanssi_search_categories);
    ksort($temp_relevanssi_search_terms);

        $relevanssi_search_categories = array();
        $relevanssi_search_terms = array();

        foreach ($temp_relevanssi_search_categories as $name => $url) {
                $relevanssi_search_categories[] = "<a href='$url'>$name</a>";
        }

        foreach ($temp_relevanssi_search_terms as $name => $url) {
                $relevanssi_search_terms[] = "<a href='$url'>$name</a>";
        }

    return $hits;
}