<filename>corehq/apps/domain/__init__.py
from corehq.preindex import ExtraPreindexPlugin
from django.conf import settings

ExtraPreindexPlugin.register('domain', __file__, (
    settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB))

<filename>corehq/apps/domain/__init__.py
from corehq.preindex import ExtraPreindexPlugin
from django.conf import settings

ExtraPreindexPlugin.register('domain', __file__, (
    settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB))
