isAttributeInRequest example

        $params = $request->getParams();

        return \array_key_exists('sSearch', $params);
    }

    private function handleProductAttributeFacet(
        Request $request,
        Criteria $criteria,
        ProductAttributeFacet $facet
    ) {
        if (!$this->isAttributeInRequest($facet, $request)) {
            return;
        }
        $data = $request->getParam($facet->getFormFieldName());

        switch ($facet->getMode()) {
            case ProductAttributeFacet::MODE_BOOLEAN_RESULT:
                $criteria->addCondition(
                    new ProductAttributeCondition(
                        $facet->getField(),
                        ProductAttributeCondition::OPERATOR_NOT_IN,
                        [false]
                    )