[[query-dsl-geo-polygon-filter]]
=== Geo Polygon Filter

A filter allowing to include hits that only fall within a polygon of
points. Here is an example:

[source,js]
--------------------------------------------------
{
    "filtered" : {
        "query" : {
            "match_all" : {}
        },
        "filter" : {
            "geo_polygon" : {
                "person.location" : {
                    "points" : [
                        {"lat" : 40, "lon" : -70},
                        {"lat" : 30, "lon" : -80},
                        {"lat" : 20, "lon" : -90}
                    ]
                }
            }
        }
    }
}
--------------------------------------------------

[float]
==== Allowed Formats

[float]
===== Lat Long as Array

Format in `[lon, lat]`, note, the order of lon/lat here in order to
conform with http://geojson.org/[GeoJSON].

[source,js]
--------------------------------------------------
{
    "filtered" : {
        "query" : {
            "match_all" : {}
        },
        "filter" : {
            "geo_polygon" : {
                "person.location" : {
                    "points" : [
                        [-70, 40],
                        [-80, 30],
                        [-90, 20]
                    ]
                }
            }
        }
    }
}
--------------------------------------------------

[float]
===== Lat Lon as String

Format in `lat,lon`.

[source,js]
--------------------------------------------------
{
    "filtered" : {
        "query" : {
            "match_all" : {}
        },
        "filter" : {
            "geo_polygon" : {
                "person.location" : {
                    "points" : [
                        "40, -70",
                        "30, -80",
                        "20, -90"
                    ]
                }
            }
        }
    }
}
--------------------------------------------------

[float]
===== Geohash

[source,js]
--------------------------------------------------
{
    "filtered" : {
        "query" : {
            "match_all" : {}
        },
        "filter" : {
            "geo_polygon" : {
                "person.location" : {
                    "points" : [
                        "drn5x1g8cu2y",
                        "30, -80",
                        "20, -90"
                    ]
                }
            }
        }
    }
}
--------------------------------------------------

[float]
==== geo_point Type

The filter *requires* the
<<mapping-geo-point-type,geo_point>> type to be
set on the relevant field.

[float]
==== Caching

The result of the filter is not cached by default. The `_cache` can be
set to `true` to cache the *result* of the filter. This is handy when
the same points parameters are used on several (many) other queries.
Note, the process of caching the first execution is higher when caching
(since it needs to satisfy different queries).
