Is this method being used anywhere?  If not, you can probably just remove it, otherwise, it should probably be replaced with the result of the elasticsearch query anyways.  The [`_report_user_dict`](https://github.com/dimagi/commcare-hq/blob/master/corehq/apps/reports/util.py#L191) function could be useful here if you need access to some of the methods available on the user model.