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Geo Distance Query

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Geo Distance Query

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Filters documents that include only hits that exists within a specific distance from a geo point. Assuming the following mapping and indexed document:

PUT /my_locations
{
    "mappings": {
        "_doc": {
            "properties": {
                "pin": {
                    "properties": {
                        "location": {
                            "type": "geo_point"
                        }
                    }
                }
            }
        }
    }
}

PUT /my_locations/_doc/1
{
    "pin" : {
        "location" : {
            "lat" : 40.12,
            "lon" : -71.34
        }
    }
}

Then the following simple query can be executed with a geo_distance filter:

GET /my_locations/_search
{
    "query": {
        "bool" : {
            "must" : {
                "match_all" : {}
            },
            "filter" : {
                "geo_distance" : {
                    "distance" : "200km",
                    "pin.location" : {
                        "lat" : 40,
                        "lon" : -70
                    }
                }
            }
        }
    }
}

Accepted Formats

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In much the same way the geo_point type can accept different representations of the geo point, the filter can accept it as well:

Lat Lon As Properties

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GET /my_locations/_search
{
    "query": {
        "bool" : {
            "must" : {
                "match_all" : {}
            },
            "filter" : {
                "geo_distance" : {
                    "distance" : "12km",
                    "pin.location" : {
                        "lat" : 40,
                        "lon" : -70
                    }
                }
            }
        }
    }
}

Lat Lon As Array

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Format in [lon, lat], note, the order of lon/lat here in order to conform with GeoJSON.

GET /my_locations/_search
{
    "query": {
        "bool" : {
            "must" : {
                "match_all" : {}
            },
            "filter" : {
                "geo_distance" : {
                    "distance" : "12km",
                    "pin.location" : [-70, 40]
                }
            }
        }
    }
}

Lat Lon As String

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Format in lat,lon.

GET /my_locations/_search
{
    "query": {
        "bool" : {
            "must" : {
                "match_all" : {}
            },
            "filter" : {
                "geo_distance" : {
                    "distance" : "12km",
                    "pin.location" : "40,-70"
                }
            }
        }
    }
}

Geohash

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GET /my_locations/_search
{
    "query": {
        "bool" : {
            "must" : {
                "match_all" : {}
            },
            "filter" : {
                "geo_distance" : {
                    "distance" : "12km",
                    "pin.location" : "drm3btev3e86"
                }
            }
        }
    }
}

Options

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The following are options allowed on the filter:

`distance`	The radius of the circle centred on the specified location. Points which fall into this circle are considered to be matches. The `distance` can be specified in various units. See Distance Units.
`distance_type`	How to compute the distance. Can either be `arc` (default), or `plane` (faster, but inaccurate on long distances and close to the poles).
`_name`	Optional name field to identify the query
`validation_method`	Set to `IGNORE_MALFORMED` to accept geo points with invalid latitude or longitude, set to `COERCE` to additionally try and infer correct coordinates (default is `STRICT`).

geo_point Type

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The filter requires the geo_point type to be set on the relevant field.

Multi Location Per Document

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The geo_distance filter can work with multiple locations / points per document. Once a single location / point matches the filter, the document will be included in the filter.

Ignore Unmapped

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When set to true the ignore_unmapped option will ignore an unmapped field and will not match any documents for this query. This can be useful when querying multiple indexes which might have different mappings. When set to false (the default value) the query will throw an exception if the field is not mapped.

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