docs: public Waiter<DescribeConversionTasksRequest> conversionTaskCancelled() {
  
          return new WaiterBuilder<DescribeConversionTasksRequest, DescribeConversionTasksResult>().withSdkFunction(new DescribeConversionTasksFunction(client))
                  .withAcceptors(new ConversionTaskCancelled.IsCancelledMatcher())
                  .withDefaultPollingStrategy(new PollingStrategy(new MaxAttemptsRetryStrategy(40), new FixedDelayStrategy(15)))
                  .withExecutorService(executorService).build();
      }