public function updateFlag($key, $state = TRUE)
    {
        $this->update($key, Riak\DataType\Map::FLAG, $state);

        return $this;
    }
public function updateFlag($key, $state = TRUE)
    {
        $this->update($key, Riak\DataType\Map::FLAG, $state);

        return $this;
    }
@param $key
@param bool $state

@return $this