code: function listDatasetClientRecords(datasetClientJson, projection, cb) {
    debug('listDatasetClientRecords datasetClientJson = %j', datasetClientJson);
    var datasetId = datasetClientJson.datasetId;
    var datasetRecordsCol = mongoClient.collection(getDatasetRecordsCollectionName(datasetId));
    var cursor = datasetRecordsCol.find({'refs': datasetClientJson.id});
    if (projection) {
      cursor = cursor.project(projection);
    } else {
      cursor = cursor.project({'refs': 0});
    }
    return cursor.toArray(function(err, records) {
      if (err) {
        debug('[%s] Failed to list datasetClient records due to error %s :: datasetClientJson = %j', err, datasetClientJson);
      }
      return cb(err, records);
    });
  }
docs: List the local records for the given datasetClient from the `fhsync-<datasetId>-records` collection
  @param {storage~DatasetClient} datasetClientJson the json object of the datasetClient. It should have the `datasetId` field
  @param {Object} projection can be used to specify what fields should be returned for the records. Each record will have `uid`, 'hash' and `data` fields.
  @param {Function} cb