$query = $this->createQueryBuilder()
            ->field('Coordinates')->near($longitude, $latitude)
            ->debug();
        var_dump($query);


OUTPUT
array(3) { ["type"]=> int(10) ["mapReduce"]=> array(3) { ["map"]=> NULL ["reduce"]=> NULL ["options"]=> array(0) { } } ["near"]=> array(1) { ["Coordinates"]=> float(50) } }