code: function getMongodbConnection(mongoDbUrl, logger, cb) {
    logger.debug("creating mongodb connection for data_source_update job", {mongoDbUrl: mongoDbUrl});
    MongoClient.connect(mongoDbUrl, cb);
  }
docs: Create a new mongodb connection.
  @param {string} mongoDbUrl the url to connect to the mongodb database
  @param {object} logger
  @param {function} cb the callback function