elasticsearch 5.0 scroll to end scrolltoend

some-es6-class.js

  fetchStuff(min, max = min) {

    const body = new Bodybuilder();

    body.size(3);
    body.filter('range', 'timestamp', {
      gte: min,
      lte: max
    });

    return this.elasticsearch.search({
      index: 'my-alias',
      type: 'my-doc',
      body: body.build('v2'), // have not upgraded to newer bodybuilder package yet
      scroll: '15s'
    })
    .then((res) => this._scrollToEnd(res, []))
    .then((events) => {

      // sort by timestamp then _id
      events = _.sortBy(events, ['_.source.timestamp', '_id']);

      return events;

    });

  }

  _scrollToEnd(res, events) {
    return Promise.resolve().then(() => {

      events = events.concat(_.get(res, 'hits.hits', []));

      if (res.hits.total > events.length) {
        return this.elasticsearch.scroll({
          scrollId: res._scroll_id,
          scroll: '15s'
        })
        .then((res) => this._scrollToEnd(res, events));
      }

      return events;

    });
  }