In 6.6 a new indexing strategy was introduced based on Lucene's BKD tree and a decomposition of polygons into triangles:
This strategy has been made the default and unfortunely it does not support filtering by distance yet. Therefore If you need such functionality you can just off the strategy to your mapping:
{
"mappings": {
"doc": {
"properties": {
"location": {
"type": "geo_shape",
"strategy" : "recursive"
}
}
}
}
}