edit()

 public String edit() {
        try {
            repositoryRevisionHistory.save(revisionHistoryServices.getRevisionHistory(pais.getIdpais(),
                    "myusername",
                    "update", "pais", paisRepository.toDocument(pais).toString()));

            pais = paisRepository.addUserInfoForEditMethod(pais, "myusername", "update");
            paisRepository.update(pais);
            JsfUtil.successMessage("Se actualizo el documento");
        } catch (Exception e) {
            JsfUtil.errorDialog("edit()", e.getLocalizedMessage());
        }
        return "";
    }