Does Elasticsearch support geo queries like ST_DWithin in postgis - elasticsearch

Question

How to perform such query in Elasticsearch that whether a geo_point is within the specified distance(or radius/buffer) of a line(depicted by 2 pairs of lat/lon)
shape like this

Answer 1

This is not implemented in Elastic as far as I know. But you can still achieve what you want by calculating the polygon offline and then use it in a geo_polygon query. The geo_shape query could also be used but you need a geo_shape field instead of a geo_point one.
So, for instance, using turf you can precompute the polygon around the line using the buffer feature. Below, I'm defining a line along some road somewhere in San Jose (CA) and a buffer of 50 meters around that line/road:
const line = turf.lineString([[-121.862282,37.315430], [-121.851553,37.305532]], {name: 'line 1'});
const bufferPoly = turf.buffer(line, 50, {units: 'meters'});
You'll get the following polygon (abbreviated)
{
"type": "Feature",
"properties": {
"name": "line 1"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
-121.85121372045873,
37.305765606399724
],
[
-121.85116304254947,
37.30570833334188
],
[
-121.85112738572346,
37.30564429665501
],
[
-121.85110812025259,
37.30557595721911
],
...
[
-121.85121372045873,
37.305765606399724
]
]
]
}
}
Which looks like this:
Then you can leverage the geo_polygon query like this:
GET /_search
{
"query": {
"bool": {
"must": {
"match_all": {}
},
"filter": {
"geo_polygon": {
"your_geo_point": {
"points": [
[
-121.85121372045873,
37.305765606399724
],
[
-121.85116304254947,
37.30570833334188
],
[
-121.85112738572346,
37.30564429665501
],
[
-121.85110812025259,
37.30557595721911
],
...
[
-121.85121372045873,
37.305765606399724
]
]
}
}
}
}
}
}