protected function _createFilterSlug(array $filterData)
    {
        /** @var Filter $existingFilter */
        $existingFilter = $this->Filters->find('slugForFilterData', [
            'request' => $this->request,
            'filterData' => $filterData
        ])->first();

        if ($existingFilter) {
            return $existingFilter->slug;
        }

        return $this->Filters->createFilterForFilterData($this->request, $filterData);
    }