ElasticSearch _geo_distance sort error.

gistfile1.txt

curl "localhost:9200/api/_search?pretty=true" -d '{
	"query":{
		"term":{
			"django_ct":"auth.user"
		}
	}
}'

{
  "took" : 3,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 3509,
    "max_score" : 3.1359458,
    "hits" : [ {
      "_index" : "api",
      "_type" : "modelresult",
      "_id" : "auth.user.323",
      "_score" : 3.1359458, 
      "_source" : {
      	"django_id": "323", "last_name": "xxx", "first_name": "xxx", "django_ct": "auth.user", "content_auto": "xxx xxx", "location": "48.0513369,-65.459684"}
    	}, 
    
    .... etc.
    
    
curl "localhost:9200/api/_search?pretty=true" -d '{
	"query":{
		"term":{
			"django_ct":"auth.user"
		}
	}, 
	"sort":[
		{
			"_geo_distance":{
				"unit":"km", 
				"location": "48, -65"
			}
		}
	]
}'

{
  "error" : "SearchPhaseExecutionException[Failed to execute phase [query], all shards failed; shardFailures {[O0acdq3ySwWsVXUi6-mwWw][api][0]: SearchParseException[[api][0]: query[django_ct:auth.user],from[-1],size[-1]: Parse Failure [Failed to parse source [{\"query\":{\"term\":{\"django_ct\":\"auth.user\"}}, \"sort\":[{\"_geo_distance\":{\"unit\":\"km\", \"location\": \"48, -65\"}}]}]]]; nested: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexGeoPointFieldData]; }{[O0acdq3ySwWsVXUi6-mwWw][api][1]: SearchParseException[[api][1]: query[django_ct:auth.user],from[-1],size[-1]: Parse Failure [Failed to parse source [{\"query\":{\"term\":{\"django_ct\":\"auth.user\"}}, \"sort\":[{\"_geo_distance\":{\"unit\":\"km\", \"location\": \"48, -65\"}}]}]]]; nested: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexGeoPointFieldData]; }{[O0acdq3ySwWsVXUi6-mwWw][api][4]: SearchParseException[[api][4]: query[django_ct:auth.user],from[-1],size[-1]: Parse Failure [Failed to parse source [{\"query\":{\"term\":{\"django_ct\":\"auth.user\"}}, \"sort\":[{\"_geo_distance\":{\"unit\":\"km\", \"location\": \"48, -65\"}}]}]]]; nested: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexGeoPointFieldData]; }{[O0acdq3ySwWsVXUi6-mwWw][api][2]: SearchParseException[[api][2]: query[django_ct:auth.user],from[-1],size[-1]: Parse Failure [Failed to parse source [{\"query\":{\"term\":{\"django_ct\":\"auth.user\"}}, \"sort\":[{\"_geo_distance\":{\"unit\":\"km\", \"location\": \"48, -65\"}}]}]]]; nested: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexGeoPointFieldData]; }{[O0acdq3ySwWsVXUi6-mwWw][api][3]: SearchParseException[[api][3]: query[django_ct:auth.user],from[-1],size[-1]: Parse Failure [Failed to parse source [{\"query\":{\"term\":{\"django_ct\":\"auth.user\"}}, \"sort\":[{\"_geo_distance\":{\"unit\":\"km\", \"location\": \"48, -65\"}}]}]]]; nested: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexGeoPointFieldData]; }]",
  "status" : 400
}