default_batch_fetch_size: 100 으로 설정을 해줘도 쿼리가 한번에 가져오지 않습니다.

    @GetMapping("api/v2/orders/{id}") // batch_fetch_size 검색용
    public ResultMany findByBatchFetch(@PathVariable("id") Long id) {
        Customer customer = customerService.findCustomerById(id);
        List<Order> orders = orderRepository.findAllOrder();
        return getOrderDtoList(orders);
    }

    public List<Order> findAllOrder() {
        return em.createQuery("select o from Order o", Order.class)
                .getResultList();
    }

private ResultMany getOrderDtoList(List<Order> orders) {
    List<OrderDto> orderDtos = orders.stream()
            .map(o -> new OrderDto(o))
            .collect(Collectors.toList());
    return new ResultMany<>(orders.size(), orderDtos);
}

@Data
static class OrderDto {
    private Long id;
    private CustomerDto customer;
    private List<DiffuserProductRequestDto> diffuserProductRequest;
    public OrderDto (Order order) {
        id = order.getId();
        customer = new CustomerDto(order.getCustomer());
        diffuserProductRequest = order.getDiffuserProductRequests().stream()
                .map(diff -> new DiffuserProductRequestDto(diff))
                .collect(Collectors.toList());
    }
}

@Data
static class DiffuserProductRequestDto {

    private Long id;

    private DiffuserDto diffuser;

    private int amount;

    private Deadline deadline;

    private ProductionStatus status;

    public DiffuserProductRequestDto (DiffuserProductRequest diffuserProductRequest) {
        id = diffuserProductRequest.getId();
        diffuser = new DiffuserDto(diffuserProductRequest.getDiffuser());
        amount = diffuserProductRequest.getAmount();
        deadline = diffuserProductRequest.getDeadline();
        status = diffuserProductRequest.getStatus();
    }
}

위에는 order클래스 연관된 클래스를 찾기위한 코드들인데 제가 27개의 오더를 만들고 get요청을 보내면 default_batch_fetch_size: 100으로 설정 해놓았기 때문에 27개를 한번에 가져올 것이라고 생각하고 있는데 결과는 그렇지 않습니다

이렇게 두번의 쿼리로 찾아오는데 어떤게 문제인걸까요?