code: @Override
      public DescribeTargetHealthResult describeTargetHealth(DescribeTargetHealthRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeTargetHealth(request);
      }
docs: <p>
  Describes the health of the specified targets or all of your targets.
  </p>
  
  @param describeTargetHealthRequest
  @return Result of the DescribeTargetHealth operation returned by the service.
  @throws InvalidTargetException
  The specified target does not exist, is not in the same VPC as the target group, or has an unsupported
  instance type.
  @throws TargetGroupNotFoundException
  The specified target group does not exist.
  @throws HealthUnavailableException
  The health of the specified targets could not be retrieved due to an internal error.
  @sample AmazonElasticLoadBalancing.DescribeTargetHealth
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticloadbalancingv2-2015-12-01/DescribeTargetHealth"
  target="_top">AWS API Documentation</a>