code: public java.util.List<UnsuccessfulItem> getUnsuccessful() {
          if (unsuccessful == null) {
              unsuccessful = new com.amazonaws.internal.SdkInternalList<UnsuccessfulItem>();
          }
          return unsuccessful;
      }
docs: <p>
  Information about the flow logs that could not be created successfully.
  </p>
  
  @return Information about the flow logs that could not be created successfully.