@Override
      public @NotNull Map<IdIndexEntry, Integer> map(@NotNull FileContent inputData,
                                                     @NotNull FileTypeSpecificSubIndexer<IdIndexer> indexer) throws MapReduceIndexMappingException {
        IdIndexer subIndexerType = indexer.getSubIndexerType();
        try {
          return subIndexerType.map(inputData);
        }
        catch (Exception e) {
          if (e instanceof ControlFlowException) throw e;
          throw new MapReduceIndexMappingException(e, subIndexerType.getClass());
        }
      }
@Override
      public @NotNull Map<IdIndexEntry, Integer> map(@NotNull FileContent inputData,
                                                     @NotNull FileTypeSpecificSubIndexer<IdIndexer> indexer)