static class NormsWarmer extends IndicesWarmer.Listener {
@Override
public TerminationHandle warmNewReaders(final IndexShard indexShard, IndexMetaData indexMetaData, final WarmerContext context, ThreadPool threadPool) {
final Loading defaultLoading = Loading.parse(indexMetaData.settings().get(NORMS_LOADING_KEY), Loading.LAZY);
final MapperService mapperService = indexShard.mapperService();
final ObjectSet<String> warmUp = new ObjectOpenHashSet<>();
for (DocumentMapper docMapper : mapperService.docMappers(false)) {
for (FieldMapper<?> fieldMapper : docMapper.mappers()) {
final String indexName = fieldMapper.names().indexName();