Sorting with _geo_distance will throw ClassCastException exception

created index with mapping:

"mappings": {
"city": {
"properties": {
"name": {
"type": "string",
"store": "yes",
"index": "analyzed"
},
"location": {
"type": "geo_point"
}
}
}
}

and search/sort with _geo_distance:

"query": {
"match_all": {}
},
"fields": "name",
"sort": {
"_geo_distance": {
"location": [
121.571079,
25.049787
],
"unit": "km"
}
}

will throw
ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData
cannot be cast to org.elasticsearch.index.fielddata.IndexGeoPointFieldData]
exception.

Elasticsearch version: 1.1.0

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Do you have any steps to reproduce? I'm very curious what causes this.
Thanks!

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