Elasticsearch nested aggregation with range aggregation - ruby-on-rails-4

Question

I am very new to ElasticSearch and trying to figure out a situation
where I have to show particular JSON data from Elasticsearch. Please
see below code
def bucket_for_order_amount(buckets, aggregations)
buckets['order_range'] = {
range: {
field: :total,
keyed: true,
ranges: [
{ to: 25.0 },
{ from: 25.0, to: 50.0 },
{ from: 50.0, to: 75.0 },
{ from: 75.0, to: 100.0 },
{ from: 100.0 }
]
}
}
end
This will return JON response:
"report": {
"order_range": {
"buckets": {
"*-25.0": {
"to": 25,
"doc_count": 0
},
"25.0-50.0": {
"from": 25,
"to": 50,
"doc_count": 0
},
"50.0-75.0": {
"from": 50,
"to": 75,
"doc_count": 0
},
"75.0-100.0": {
"from": 75,
"to": 100,
"doc_count": 0
},
"100.0-*": {
"from": 100,
"doc_count": 2
}
}
}
I have a situation where I have to show the users listing inside the doc_count if any user exists in that range but I am not sure which
aggregation need to use to achieve this response.
The response would be like this:-
"*-25.0": {
"to": 25,
"doc_count": 2
{
user1,
user2
},
},

Answer 1

You can use the top_hits sub-aggregation for that purpose:
def bucket_for_order_amount(buckets, aggregations)
buckets['order_range'] = {
range: {
field: :total,
keyed: true,
ranges: [
{ to: 25.0 },
{ from: 25.0, to: 50.0 },
{ from: 50.0, to: 75.0 },
{ from: 75.0, to: 100.0 },
{ from: 100.0 }
]
},
aggs: {
users: { top_hits: {} }
}
}
end