private List<DruidCoordinatorHelper> makeIndexingServiceHelpers(final AtomicReference<DatasourceWhitelist> whitelistRef)
{
List<DruidCoordinatorHelper> helpers = Lists.newArrayList();
helpers.add(new DruidCoordinatorSegmentInfoLoader(DruidCoordinator.this));
if (config.isConvertSegments()) {
helpers.add(new DruidCoordinatorVersionConverter(indexingServiceClient, whitelistRef));
}
if (config.isMergeSegments()) {