Select2 Custom Template Classname, style (optgroup,option, li)

$(".js-data-example-ajax").select2({
            width:"off",
            placeholder: '{% trans from "content" %}content.select.placeholder{% endtrans %}',
            language: "{{ app.request.getLocale() }}",
            templateResult: function (data) {
            
                if (!data.element) {
                    return data.text;
                }

                var $element = $(data.element);

                var $wrapper = $('<span></span>');
                $wrapper.addClass($element[0].className);

                var style = $element.attr('style');
                $wrapper.attr('style',style);

                $wrapper.text(data.text);

                return $wrapper;
            },

            theme: "bootstrap"
        });