old_contents: from corehq.preindex import CouchAppsPreindexPlugin
  from django.conf import settings
  
  CouchAppsPreindexPlugin.register('couchapps', __file__, {
      'form_question_schema': 'meta',
      'users_extra': (settings.USERS_GROUPS_DB, settings.NEW_USERS_GROUPS_DB),
      'noneulized_users': (settings.USERS_GROUPS_DB, settings.NEW_USERS_GROUPS_DB),
      'all_docs': (None, settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB),
      'by_domain_doc_type_date': (None, settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB, 'meta'),
  })
  
new_contents: from corehq.preindex import CouchAppsPreindexPlugin
  from django.conf import settings
  
  CouchAppsPreindexPlugin.register('couchapps', __file__, {
      'form_question_schema': 'meta',
      'users_extra': (settings.USERS_GROUPS_DB, settings.NEW_USERS_GROUPS_DB),
      'noneulized_users': (settings.USERS_GROUPS_DB, settings.NEW_USERS_GROUPS_DB),
      'all_docs': (None, settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB, 'meta'),
      'by_domain_doc_type_date': (None, settings.NEW_USERS_GROUPS_DB, settings.NEW_FIXTURES_DB, 'meta'),
  })
  
subject: make all_docs index meta db