Hi Adam,
ok, gotcha. sorry for the misunderstanding.
That is also not possible :$. I will update the ticket on github correspondingly. The reason is the same. The map in Kibana is primarily to display ES aggregations, not individual data points (or in this case, lines).
I have no personal experience with this, but perhaps this could be useful: an Elasticsearch extension for geoserver: https://github.com/ngageoint/elasticgeo/blob/master/gs-web-elasticsearch/doc/index.rst. You can then create a WMS server with your route-data, and show it like that in Kibana. YMMV.