Geo: Geo-shape circles using radius as diameter

[clintongormley]

PUT /attractions
{
  "mappings": {
    "landmark": {
      "properties": {
        "name": {
          "type": "string"
        },
        "location": {
          "type": "geo_shape"
        }
      }
    }
  }
}

PUT /attractions/landmark/dam_square
{
    "name" : "Dam Square, Amsterdam",
    "location" : {
        "type" : "polygon", 
        "coordinates" : [[ 
          [ 4.89218, 52.37356 ], 
          [ 4.89205, 52.37276 ], 
          [ 4.89301, 52.37274 ], 
          [ 4.89392, 52.37250 ], 
          [ 4.89431, 52.37287 ], 
          [ 4.89331, 52.37346 ], 
          [ 4.89305, 52.37326 ], 
          [ 4.89218, 52.37356 ]
        ]]
    }
}

This point is less than 700m from the above shape, but the search only matches if you set the radius to 1.4km, ie twice the distance:

GET /attractions/landmark/_search
{
  "query": {
    "geo_shape": {
      "location": {
        "shape": {
          "type": "circle",
          "coordinates": [
            4.89994,
            52.37815
          ],
          "radius": "1.4km"
        }
      }
    }
  }
}

I've tried the same thing at much bigger distances and it exhibits the same problem. The radius needs to be double the distance in order to overlap, which makes me think that it is being used as a diameter instead.

[tincugabriel]

Is this an elasticsearch bug or a spatial4j bug ? The code and comments for SpatialContext.makeCircle() , which is being used , names the parameter distance instead of radius, which seems a bit ambiguous to me