docs: protected FieldExtractor getMetadataExtractorOrFallback(Metadata meta, FieldExtractor fallbackExtractor) {
          if (metaExtractor != null) {
              FieldExtractor metaFE = metaExtractor.get(meta);
              if (metaFE != null) {
                  return metaFE;
              }
          }
          return fallbackExtractor;
      }