code: @POST
    @Path("me/email")
    @RolesAllowed({"ROLE_ADMIN", "ROLE_USER"})
    public Response changeEmail(@Context HttpServletRequest request, EmailRequest emailRequest) {
      Long userId = (Long) request.getAttribute(OAuth2Filter.NAME_USER_ID);
      return changeEmail(userId, emailRequest);
    }
docs: User request changing their email address.
  The new email is temporarily stored and an email is sent to the new email address for confirmation.
  
  @param emailRequest new email address
  @return 204 if success