public function apply(\Magento\Framework\App\RequestInterface $request)
{
$filter = $this->searchHelper->getFilterValue($this->getRequestVar());
if (!empty($filter)) {
$this->getLayer()->getProductCollection()->addFieldToFilter($this->getRequestVar(), $filter);
$values = $this->searchHelper->filterValueToArray($filter);
foreach ($values as $value) {
$text = $this->getOptionText($value);
$item = $this->_createItem($text, $value);
$item->setSelectedValues($values);
$this->getLayer()->getState()->addFilter($item);
}
$this->_updateItems($values);
}
}
