code: @Override
      public UpdateEndpointGroupResult updateEndpointGroup(UpdateEndpointGroupRequest request) {
          request = beforeClientExecution(request);
          return executeUpdateEndpointGroup(request);
      }
docs: <p>
  Update an endpoint group. To see an AWS CLI example of updating an endpoint group, scroll down to <b>Example</b>.
  </p>
  
  @param updateEndpointGroupRequest
  @return Result of the UpdateEndpointGroup operation returned by the service.
  @throws InvalidArgumentException
  An argument that you specified is invalid.
  @throws EndpointGroupNotFoundException
  The endpoint group that you specified doesn't exist.
  @throws InternalServiceErrorException
  There was an internal error for AWS Global Accelerator.
  @throws LimitExceededException
  Processing your request would cause you to exceed an AWS Global Accelerator limit.
  @sample AWSGlobalAccelerator.UpdateEndpointGroup
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/globalaccelerator-2018-08-08/UpdateEndpointGroup"
  target="_top">AWS API Documentation</a>