code: public void delete(String bucketName, List<KeyVersion> objects) {
          ReactiveSeq.fromList(objects)
                     .grouped(1000)
                     .forEach(l -> {
                         DeleteObjectsRequest req = new DeleteObjectsRequest(
                                                                             bucketName);
                         req.setKeys(l.toList());
                         client.deleteObjects(req);
                     });
      }
docs: Method delete all <i>objects</i> from <i>bucketName</i> in groups by 1000
  elements
  
  @param bucketName
  @param objects