Elastica\Cluster\Settings::getPersistent PHP Method

    public function getPersistent($setting = '')
    {
        $data = $this->get();
        $settings = $data['persistent'];
        if (!empty($setting)) {
            if (isset($settings[$setting])) {
                return $settings[$setting];
            } else {
                return;
            }
        }
        return $settings;
    }