@spalger/kibana/src/plugins/kibana/public/visualize/editor/agg_select.html

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

<div class="form-group">
  <label ng-if="$index < 1 || groupName !== 'buckets'">Aggregation</label>
  <label ng-if="$index >= 1 && groupName === 'buckets'">Sub Aggregation</label>
  <select
    name="agg"
    class="form-control"
    ng-model="agg.type"
    required
    auto-select-if-only-one="aggTypeOptions | aggFilter:agg.schema.aggFilter"
    ng-options="agg as agg.title for agg in aggTypeOptions | aggFilter:agg.schema.aggFilter">
  </select>
</div>