code: public void rollbackVolume(String volumeId, String snapshotId) {
          this.rollbackVolume(new RollbackVolumeRequest()
                  .withVolumeId(volumeId).withSnapshotId(snapshotId));
      }
docs: Rollback the volume with the specified volume snapshot.
  
  <p>
  You can rollback the specified volume only when the volume is Available,
  otherwise,it's will get <code>409</code> errorCode.
  <p>
  The snapshot used to rollback must be created by the volume,
  otherwise,it's will get <code>404</code> errorCode.
  <p>
  If rolling back the system volume,the instance must be Running or Stopped,
  otherwise,it's will get <code>409</code> errorCode.After rolling back the
  volume,all the system disk data will erase.
  
  @param volumeId The id of volume which will be rollback.
  @param snapshotId The id of snapshot which will be used to rollback the volume.