64 lines
1.6 KiB
Plaintext
64 lines
1.6 KiB
Plaintext
[[lat-lon]]
|
|
=== `lat_lon`
|
|
|
|
<<geo-queries,Geo-queries>> are usually performed by plugging the value of
|
|
each <<geo-point,`geo_point`>> field into a formula to determine whether it
|
|
falls into the required area or not. Unlike most queries, the inverted index
|
|
is not involved.
|
|
|
|
Setting `lat_lon` to `true` causes the latitude and longitude values to be
|
|
indexed as numeric fields (called `.lat` and `.lon`). These fields can be used
|
|
by the <<query-dsl-geo-bounding-box-query,`geo_bounding_box`>> and
|
|
<<query-dsl-geo-distance-query,`geo_distance`>> queries instead of
|
|
performing in-memory calculations.
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
PUT my_index
|
|
{
|
|
"mappings": {
|
|
"my_type": {
|
|
"properties": {
|
|
"location": {
|
|
"type": "geo_point",
|
|
"lat_lon": true <1>
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
PUT my_index/my_type/1
|
|
{
|
|
"location": {
|
|
"lat": 41.12,
|
|
"lon": -71.34
|
|
}
|
|
}
|
|
|
|
|
|
GET my_index/_search
|
|
{
|
|
"query": {
|
|
"geo_distance": {
|
|
"location": {
|
|
"lat": 41,
|
|
"lon": -71
|
|
},
|
|
"distance": "50km",
|
|
"optimize_bbox": "indexed" <2>
|
|
}
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
<1> Setting `lat_lon` to true indexes the geo-point in the `location.lat` and `location.lon` fields.
|
|
<2> The `indexed` option tells the geo-distance query to use the inverted index instead of the in-memory calculation.
|
|
|
|
Whether the in-memory or indexed operation performs better depends both on
|
|
your dataset and on the types of queries that you are running.
|
|
|
|
NOTE: The `lat_lon` option only makes sense for single-value `geo_point`
|
|
fields. It will not work with arrays of geo-points.
|
|
|