Orientation of geo_shapes is ignored

[iverase]

It seems the setting orientation for geo_shape has no effect. Here is an example:

PUT geoshape
{
  "settings":{
    "number_of_shards": 1,
    "number_of_replicas": 0
  }
}

GET geoshape/_mapping

PUT geoshape/_mapping/_doc
{
  "properties": {
    "geometry": {
      "type": "geo_shape",
      "orientation": "ccw"
    }
  }
}

PUT geoshape/_doc/1/
{
  "geometry":"POLYGON((0 0, 1 0, 1 1, 0 1, 0 0))" 
}

PUT geoshape/_doc/2/
{
  "geometry":"POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))" 
}

GET geoshape/_search

GET geoshape/_search
{
    "query":{
        "bool": {
            "must": {
                "match_all": {}
            },
            "filter": {
                "geo_shape": {
                    "geometry": {
                        "shape": {
                            "type": "point",
                            "coordinates" : [0.5, 0.5]
                        },
                        "relation": "intersects"
                    }
                }
            }
        }
    }
}

answer:

{
  "took": 2,
  "timed_out": false,
  "_shards": {
    "total": 1,
    "successful": 1,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 1,
    "hits": [
      {
        "_index": "geoshape",
        "_type": "_doc",
        "_id": "1",
        "_score": 1,
        "_source": {
          "geometry": "POLYGON((0 0, 1 0, 1 1, 0 1, 0 0))"
        }
      },
      {
        "_index": "geoshape",
        "_type": "_doc",
        "_id": "2",
        "_score": 1,
        "_source": {
          "geometry": "POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))"
        }
      }
    ]
  }
}

My expectations are that those polygons are different and mutually exclusive, but they seem to represent the same polygon regardless of the order of the vertices.

[elasticmachine]

Pinging @elastic/es-analytics-geo

[iverase]

I think I overshoot here due to my expectations (orientation defines insideness of the polygon) which is not what it is documented.

After looking at the implementation and reading careful the documentation, it seems consistent the behaviour. If the orientation of the polygon is different to the provided orientation, then the resulting polygon is the one where the length of the edges is lower than half of the hemisphere.