code: public void multipleDeleteEntities(String keyName1, String keyName2) {
      Datastore datastore = transaction.getDatastore();
      // [START multipleDeleteEntities]
      Key key1 = datastore.newKeyFactory().setKind("MyKind").newKey(keyName1);
      Key key2 = datastore.newKeyFactory().setKind("MyKind").newKey(keyName2);
      transaction.delete(key1, key2);
      transaction.commit();
      // [END multipleDeleteEntities]
    }
docs: [VARIABLE "my_key_name2"]