Elasticsearch Query String Query on Geo?

I am trying to execute a query in Elasticsearch using the Geolocation query string interface. Specifically, I am trying to get all documents back into a circle (a point with a radius). This is obviously possible using a full JSON based DSL request. However, I can't seem to find the syntax for the same search using query strings in the docs:

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html#query-string-syntax

Does this mean geo queries are not supported by query string queries?

thank