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This pipeline aggregation runs a script on each bucket in the parent aggregation to determine whether the bucket is kept in the final aggregation tree. If the script returns true the bucket is retained, if it returns false the bucket is dropped
108 lines
3.5 KiB
Plaintext
108 lines
3.5 KiB
Plaintext
[[search-aggregations-pipeline-bucket-selector-aggregation]]
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=== Bucket Selector Aggregation
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coming[2.0.0]
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experimental[]
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A parent pipeline aggregation which executes a script which determines whether the current bucket will be retained
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in the parent multi-bucket aggregation. The specified metric must be numeric and the script must return a boolean value.
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If the script language is `expression` then a numeric return value is permitted. In this case 0.0 will be evaluated as `false`
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and all other values will evaluate to true.
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Note: The bucket_selector aggregation, like all pipeline aggregations, executions after all other sibling aggregations. This means that
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using the bucket_selector aggregation to filter the returned buckets in the response does not save on execution time running the aggregations.
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==== Syntax
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A `bucket_selector` aggregation looks like this in isolation:
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[source,js]
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--------------------------------------------------
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{
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"bucket_selector": {
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"buckets_path": {
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"my_var1": "the_sum", <1>
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"my_var2": "the_value_count"
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},
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script: "my_var1 > my_var2"
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}
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}
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--------------------------------------------------
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<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
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the metrics to use for that variable.
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.`bucket_selector` Parameters
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|===
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|Parameter Name |Description |Required |Default Value
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|`script` |The script to run for this aggregation. The script can be inline, file or indexed. (see <<modules-scripting>>
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for more details) |Required |
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|`buckets_path` |A map of script variables and their associated path to the buckets we wish to use for the variable
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(see <<bucket-path-syntax>> for more details) |Required |
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|`gap_policy` |The policy to apply when gaps are found in the data (see <<gap-policy>> for more
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details)|Optional, defaults to `skip` |
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|===
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The following snippet only retains buckets where the total sales for the month is less than or equal to 50:
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[source,js]
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--------------------------------------------------
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{
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"aggs" : {
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"sales_per_month" : {
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"date_histogram" : {
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"field" : "date",
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"interval" : "month"
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},
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"aggs": {
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"total_sales": {
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"sum": {
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"field": "price"
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}
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}
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"sales_bucket_filter": {
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"bucket_selector": {
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"buckets_paths": {
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"totalSales": "total_sales"
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},
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"script": "totalSales <= 50"
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}
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}
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}
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}
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}
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}
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--------------------------------------------------
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And the following may be the response:
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[source,js]
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--------------------------------------------------
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{
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"aggregations": {
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"sales_per_month": {
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"buckets": [
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{
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"key_as_string": "2015/01/01 00:00:00",
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"key": 1420070400000,
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"doc_count": 3,
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"total_sales": {
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"value": 50
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}
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},<1>
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{
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"key_as_string": "2015/03/01 00:00:00",
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"key": 1425168000000,
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"doc_count": 2,
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"total_sales": {
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"value": 40
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},
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}
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]
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}
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}
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}
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--------------------------------------------------
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<1> Bucket for `2015/02/01 00:00:00` has been removed as its total sales exceeded 50
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