code: function doListUpdates(datasetId, criteria, options, callback) {
    debug('[%s] doListUpdates criteria = %j',datasetId,criteria);
    var updatesCollection = mongoClient.collection(getDatasetUpdatesCollectionName(datasetId));
    var docLimit = options && options.limit;
    var cursor = updatesCollection.find(criteria);
    if (docLimit && docLimit > 0) {
      cursor = cursor.limit(docLimit);
    }
    cursor.toArray(function(err, updates) {
      if (err) {
        debugError('[%s] Failed to doListUpdates due to error %s :: criteria = %j' + criteria,datasetId,err,criteria);
        return callback(err);
      }
      return callback(null, updates);
    });
  }
docs: List all the updates that match the given search criteria
  
  @param {String} datasetId
  @param {Object} criteria
  @param {Object} options
  @param {Function} callback