code: public OperationFuture<List<LoadBalancer>> delete(List<LoadBalancer> loadBalancerList) {
          List<JobFuture> jobs =
              loadBalancerList
                  .stream()
                  .map(reference -> delete(reference).jobFuture())
                  .collect(toList());
  
          return new OperationFuture<>(
              loadBalancerList,
              new ParallelJobsFuture(jobs)
          );
      }
docs: Delete load balancer list
  
  @param loadBalancerList load balancer list
  @return OperationFuture wrapper for load balancer list