117 lines
3.8 KiB
Plaintext
117 lines
3.8 KiB
Plaintext
[[search-aggregations-pipeline-bucket-selector-aggregation]]
|
|
=== Bucket Selector Aggregation
|
|
|
|
experimental[]
|
|
|
|
A parent pipeline aggregation which executes a script which determines whether the current bucket will be retained
|
|
in the parent multi-bucket aggregation. The specified metric must be numeric and the script must return a boolean value.
|
|
If the script language is `expression` then a numeric return value is permitted. In this case 0.0 will be evaluated as `false`
|
|
and all other values will evaluate to true.
|
|
|
|
Note: The bucket_selector aggregation, like all pipeline aggregations, executions after all other sibling aggregations. This means that
|
|
using the bucket_selector aggregation to filter the returned buckets in the response does not save on execution time running the aggregations.
|
|
|
|
==== Syntax
|
|
|
|
A `bucket_selector` aggregation looks like this in isolation:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
{
|
|
"bucket_selector": {
|
|
"buckets_path": {
|
|
"my_var1": "the_sum", <1>
|
|
"my_var2": "the_value_count"
|
|
},
|
|
"script": "params.my_var1 > params.my_var2"
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
<1> Here, `my_var1` is the name of the variable for this buckets path to use in the script, `the_sum` is the path to
|
|
the metrics to use for that variable.
|
|
|
|
|
|
.`bucket_selector` Parameters
|
|
|===
|
|
|Parameter Name |Description |Required |Default Value
|
|
|`script` |The script to run for this aggregation. The script can be inline, file or indexed. (see <<modules-scripting>>
|
|
for more details) |Required |
|
|
|`buckets_path` |A map of script variables and their associated path to the buckets we wish to use for the variable
|
|
(see <<buckets-path-syntax>> for more details) |Required |
|
|
|`gap_policy` |The policy to apply when gaps are found in the data (see <<gap-policy>> for more
|
|
details)|Optional |`skip`
|
|
|===
|
|
|
|
The following snippet only retains buckets where the total sales for the month is more than 400:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
POST /sales/_search
|
|
{
|
|
"size": 0,
|
|
"aggs" : {
|
|
"sales_per_month" : {
|
|
"date_histogram" : {
|
|
"field" : "date",
|
|
"interval" : "month"
|
|
},
|
|
"aggs": {
|
|
"total_sales": {
|
|
"sum": {
|
|
"field": "price"
|
|
}
|
|
},
|
|
"sales_bucket_filter": {
|
|
"bucket_selector": {
|
|
"buckets_path": {
|
|
"totalSales": "total_sales"
|
|
},
|
|
"script": "params.totalSales > 200"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[setup:sales]
|
|
|
|
And the following may be the response:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
{
|
|
"took": 11,
|
|
"timed_out": false,
|
|
"_shards": ...,
|
|
"hits": ...,
|
|
"aggregations": {
|
|
"sales_per_month": {
|
|
"buckets": [
|
|
{
|
|
"key_as_string": "2015/01/01 00:00:00",
|
|
"key": 1420070400000,
|
|
"doc_count": 3,
|
|
"total_sales": {
|
|
"value": 550.0
|
|
}
|
|
},<1>
|
|
{
|
|
"key_as_string": "2015/03/01 00:00:00",
|
|
"key": 1425168000000,
|
|
"doc_count": 2,
|
|
"total_sales": {
|
|
"value": 375.0
|
|
},
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// TESTRESPONSE[s/"took": 11/"took": $body.took/]
|
|
// TESTRESPONSE[s/"_shards": \.\.\./"_shards": $body._shards/]
|
|
// TESTRESPONSE[s/"hits": \.\.\./"hits": $body.hits/]
|
|
<1> Bucket for `2015/02/01 00:00:00` has been removed as its total sales was less than 200
|