public function getActiveFilters()
{
$requestParams = array_keys($this->getRequest()->getParams());
$displayedFilters = $this->getDisplayedFilters();
$expandedFacets = $this->_scopeConfig->getValue(self::DEFAULT_EXPANDED_FACETS_COUNT_CONFIG_XML_PATH);
$activeFilters = range(0, min(count($displayedFilters), $expandedFacets) - 1);
foreach ($displayedFilters as $index => $filter) {
if (in_array($filter->getRequestVar(), $requestParams)) {
$activeFilters[] = $index;
}
}
return json_encode($activeFilters);
}