update the given dataset client with the given records
@param {String} datasetClientId the id of the datasetClient
@param {storage~DatasetClient} fields the fields to update
@param {storage~DatasetClientRecord[]} records an array of records to save
@param {Function} callback
function(datasetClientId, fields, records, callback) {
      return metrics.timeAsyncFunc(metrics.KEYS.MONGODB_OPERATION_TIME, doUpdateDatasetClientWithRecords)(datasetClientId, fields, records, callback);
    }