blob: f5872bdc5dcc87ffc574cb3d34ce9b0b3c4e3747 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
[[search-aggregations-bucket-nested-aggregation]]
=== Nested Aggregation
A special single bucket aggregation that enables aggregating nested documents.
For example, lets say we have a index of products, and each product holds the list of resellers - each having its own
price for the product. The mapping could look like:
[source,js]
--------------------------------------------------
{
...
"product" : {
"properties" : {
"resellers" : { <1>
"type" : "nested",
"properties" : {
"name" : { "type" : "string" },
"price" : { "type" : "double" }
}
}
}
}
}
--------------------------------------------------
<1> The `resellers` is an array that holds nested documents under the `product` object.
The following aggregations will return the minimum price products can be purchased in:
[source,js]
--------------------------------------------------
{
"query" : {
"match" : { "name" : "led tv" }
},
"aggs" : {
"resellers" : {
"nested" : {
"path" : "resellers"
},
"aggs" : {
"min_price" : { "min" : { "field" : "resellers.price" } }
}
}
}
}
--------------------------------------------------
As you can see above, the nested aggregation requires the `path` of the nested documents within the top level documents.
Then one can define any type of aggregation over these nested documents.
Response:
[source,js]
--------------------------------------------------
{
"aggregations": {
"resellers": {
"min_price": {
"value" : 350
}
}
}
}
--------------------------------------------------
|
