code: @Override
      public Cells transformElement(Tuple2<Object, BSONObject> tuple,
                                    DeepJobConfig<Cells, ? extends DeepJobConfig> config) {
  
          try {
              return UtilMongoDB.getCellFromBson(tuple._2(), deepJobConfig.getNameSpace());
          } catch (Exception e) {
              LOG.error("Cannot convert BSON: ", e);
              throw new DeepTransformException("Could not transform from Bson to Cell " + e.getMessage(), e);
          }
      }
docs: {@inheritDoc}