code: @Override
      public AttachLoadBalancersResult attachLoadBalancers(AttachLoadBalancersRequest request) {
          request = beforeClientExecution(request);
          return executeAttachLoadBalancers(request);
      }
docs: <p>
  Attaches one or more Classic Load Balancers to the specified Auto Scaling group.
  </p>
  <p>
  To attach an Application Load Balancer or a Network Load Balancer instead, see
  <a>AttachLoadBalancerTargetGroups</a>.
  </p>
  <p>
  To describe the load balancers for an Auto Scaling group, use <a>DescribeLoadBalancers</a>. To detach the load
  balancer from the Auto Scaling group, use <a>DetachLoadBalancers</a>.
  </p>
  <p>
  For more information, see <a
  href="https://docs.aws.amazon.com/autoscaling/ec2/userguide/attach-load-balancer-asg.html">Attaching a Load
  Balancer to Your Auto Scaling Group</a> in the <i>Amazon EC2 Auto Scaling User Guide</i>.
  </p>
  
  @param attachLoadBalancersRequest
  @return Result of the AttachLoadBalancers operation returned by the service.
  @throws ResourceContentionException
  You already have a pending update to an Amazon EC2 Auto Scaling resource (for example, an Auto Scaling
  group, instance, or load balancer).
  @throws ServiceLinkedRoleFailureException
  The service-linked role is not yet ready for use.
  @sample AmazonAutoScaling.AttachLoadBalancers
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/autoscaling-2011-01-01/AttachLoadBalancers"
  target="_top">AWS API Documentation</a>