NoMethodError: undefined method `search_using_elasticsearch?' for #<Gitlab::FakeApplicationSettings:0x00007f19b6...

https://sentry.gitlab.net/gitlab/gitlabcom/issues/1045520/

NoMethodError: undefined method `search_using_elasticsearch?' for #<Gitlab::FakeApplicationSettings:0x00007f19b6739d18>
  gitlab/current_settings.rb:20:in `method_missing'
    current_application_settings.send(name, *args, &block) # rubocop:disable GitlabSecurity/PublicSend
  search/elasticsearchable.rb:8:in `use_elasticsearch?'
    ::Gitlab::CurrentSettings.search_using_elasticsearch?(scope: elasticsearchable_scope)
  ee/search/project_service.rb:11:in `execute'
    return super unless use_elasticsearch?
  search_service.rb:48:in `search_results'
    @search_results ||= search_service.execute
  search_controller.rb:43:in `count'
    count = search_service.search_results.formatted_count(scope)
...
(124 additional frame(s) were not displayed)

NoMethodError: undefined method `search_using_elasticsearch?' for #<Gitlab::FakeApplicationSettings:0x00007f19b6739d18>