How to fetch unique geo codes from Elasticsearch? - elasticsearch

Question

I'm new to Elasticsearch. I've created the INDEX & inserted some documents by following CURL commands.
curl -XPUT 'localhost:9200/museums?pretty' -H 'Content-Type: application/json' -d'
{
"mappings": {
"doc": {
"properties": {
"location": {
"type": "geo_point"
}
}
}
}
}
'
curl -XPOST 'localhost:9200/museums/doc/_bulk?refresh&pretty' -H 'Content-Type: application/json' -d'
{"index":{"_id":1}}
{"location": "52.374081,4.912350", "name": "NEMO Science Museum"}
{"index":{"_id":2}}
{"location": "52.369219,4.901618", "name": "Museum Het Rembrandthuis"}
{"index":{"_id":3}}
{"location": "52.371667,4.914722", "name": "Nederlands Scheepvaartmuseum"}
{"index":{"_id":4}}
{"location": "51.222900,4.405200", "name": "Letterenhuis"}
{"index":{"_id":5}}
{"location": "48.861111,2.336389", "name": "Musée du Louvre"}
{"index":{"_id":6}}
{"location": "48.860000,2.327000", "name": "Musée d\u0027Orsay"}
{"index":{"_id":7}}
{"location": "52.374081,4.912350", "name": "NEMO7 Science Museum"}
{"index":{"_id":8}}
{"location": "52.369219,4.901618", "name": "Museum8 Het Rembrandthuis"}
{"index":{"_id":9}}
{"location": "52.371667,4.914722", "name": "Nederlands9 Scheepvaartmuseum"}
{"index":{"_id":10}}
{"location": "51.222900,4.405200", "name": "Letterenhuis10"}
{"index":{"_id":11}}
{"location": "48.861111,2.336389", "name": "Musée11 du Louvre"}
{"index":{"_id":12}}
{"location": "48.860000,2.327000", "name": "Musée12 d\u0027Orsay"}
'
If you'll see the curl commands I've made some duplicate documents & inserted those also. Now, I want to fetch all documents having UNIQUE GEO CODES & apply SORT(ASC) on that.
I got one sample CURL command like following.
curl -XPOST 'localhost:9200/museums/_search?size=0&pretty' -H 'Content-Type: application/json' -d'
{
"aggs" : {
"rings_around_amsterdam" : {
"geo_distance" : {
"field" : "location",
"origin" : "52.3760, 4.894",
"ranges" : [
{ "to" : 100000 },
{ "from" : 100000, "to" : 300000 },
{ "from" : 300000 }
]
}
}
}
}
'
But, it uses RANGE on that. I just want to fetch only UNIQUE GEO CODES & SORT those in ascending order. I googled also but, whatever I'm getting to fetch UNIQUE documents are works on only TEXT/NUMERIC type documents. Not on GEO CODES type document.
Need some help.

Answer 1

Try :
curl -XPOST 'localhost:9200/museums/_search?size=0&pretty' -H 'Content-Type: application/json' -d'
{
"size" : 0,
"aggs": {
"distinct_geo_distance" : {
"cardinality" : {
"field" : "location"
}
}
}
}