code: public JSONObject getObjects(List<String> objectIDs, List<String> attributesToRetrieve) throws AlgoliaException {
      return this.getObjects(objectIDs, attributesToRetrieve, RequestOptions.empty);
    }
docs: Get several objects from this index
  
  @param objectIDs            the array of unique identifier of objects to retrieve
  @param attributesToRetrieve contains the list of attributes to retrieve.