@spalger/kibana/src/ui/public/doc_table/components/table_row/open.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

<td ng-click="toggleRow()">
  <i
    class="fa discover-table-open-icon"
    ng-class="{ 'fa-caret-down': open, 'fa-caret-right': !open }">
  </i>
</td>