code: function normalizeResult(result) {
    if (result.uri) {
      console.log('normalizing', result);
      if (!result._source) {
        result._source = {};
      }
      ['title', 'timestamp', 'uri', 'annotationSummary', 'annotations', 'visitors'].forEach(function(f) {
        result._source[f] = result[f];
      });
    }
    return result;
  }
docs: FIXME normalize fields between base and _source