protected function doSave(array &$a, array $options)
    {
        $options = isset($options['safe']) ? $this->convertWriteConcern($options) : $options;
        $options = isset($options['wtimeout']) ? $this->convertWriteTimeout($options) : $options;
        $options = isset($options['timeout']) ? $this->convertSocketTimeout($options) : $options;
        return $this->riakCollection->save($a, $options);
    }