private function getFilterField()
    {
        try {
            $attribute = $this->getAttribute();
            $field     = $this->mappingHelper->getFilterField($attribute);
        } catch (\Magento\Framework\Exception\NoSuchEntityException $exception) {
            $field = $this->getAttributeCode();
        }

        return $field;
    }
private function getFilterField()
    {
        try {
            $attribute = $this->getAttribute();
            $field     = $this->mappingHelper->getFilterField($attribute);
        } catch (\Magento\Framework\Exception\NoSuchEntityException $exception) {
            $field = $this->getAttributeCode();
        }

        return $field;
    }
private function getFilterField ( ) { try { $ attribute = $ this -> getAttribute ( ) ; $ field = $ this -> mappingHelper -> getFilterField ( $ attribute ) ; } catch ( \ Magento \ Framework \ Exception \ NoSuchEntityException $ exception ) { $ field = $ this -> getAttributeCode ( ) ; } return $ field ; }
Get filter field

@return bool|string
Get filter field