code: @Override
      public ModifyTargetGroupResult modifyTargetGroup(ModifyTargetGroupRequest request) {
          request = beforeClientExecution(request);
          return executeModifyTargetGroup(request);
      }
docs: <p>
  Modifies the health checks used when evaluating the health state of the targets in the specified target group.
  </p>
  <p>
  To monitor the health of the targets, use <a>DescribeTargetHealth</a>.
  </p>
  
  @param modifyTargetGroupRequest
  @return Result of the ModifyTargetGroup operation returned by the service.
  @throws TargetGroupNotFoundException
  The specified target group does not exist.
  @throws InvalidConfigurationRequestException
  The requested configuration is not valid.
  @sample AmazonElasticLoadBalancing.ModifyTargetGroup
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticloadbalancingv2-2015-12-01/ModifyTargetGroup"
  target="_top">AWS API Documentation</a>