118 lines
3.2 KiB
Plaintext
118 lines
3.2 KiB
Plaintext
[[search-aggregations-pipeline-max-bucket-aggregation]]
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=== Max Bucket Aggregation
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A sibling pipeline aggregation which identifies the bucket(s) with the maximum value of a specified metric in a sibling aggregation
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and outputs both the value and the key(s) of the bucket(s). The specified metric must be numeric and the sibling aggregation must
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be a multi-bucket aggregation.
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==== Syntax
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A `max_bucket` aggregation looks like this in isolation:
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[source,js]
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--------------------------------------------------
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{
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"max_bucket": {
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"buckets_path": "the_sum"
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}
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}
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--------------------------------------------------
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// NOTCONSOLE
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[[max-bucket-params]]
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.`max_bucket` Parameters
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[options="header"]
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|===
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|Parameter Name |Description |Required |Default Value
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|`buckets_path` |The path to the buckets we wish to find the maximum for (see <<buckets-path-syntax>> for more
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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 | `skip`
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|`format` |format to apply to the output value of this aggregation |Optional |`null`
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|===
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The following snippet calculates the maximum of the total monthly `sales`:
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[source,console]
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--------------------------------------------------
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POST /sales/_search
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{
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"size": 0,
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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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"calendar_interval": "month"
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},
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"aggs": {
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"sales": {
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"sum": {
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"field": "price"
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}
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}
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}
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},
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"max_monthly_sales": {
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"max_bucket": {
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"buckets_path": "sales_per_month>sales" <1>
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}
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}
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}
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}
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--------------------------------------------------
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// TEST[setup:sales]
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<1> `buckets_path` instructs this max_bucket aggregation that we want the maximum value of the `sales` aggregation in the
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`sales_per_month` date histogram.
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And the following may be the response:
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[source,console-result]
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--------------------------------------------------
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{
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"took": 11,
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"timed_out": false,
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"_shards": ...,
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"hits": ...,
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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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"sales": {
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"value": 550.0
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}
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},
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{
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"key_as_string": "2015/02/01 00:00:00",
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"key": 1422748800000,
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"doc_count": 2,
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"sales": {
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"value": 60.0
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}
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},
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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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"sales": {
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"value": 375.0
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}
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}
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]
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},
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"max_monthly_sales": {
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"keys": ["2015/01/01 00:00:00"], <1>
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"value": 550.0
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}
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}
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}
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--------------------------------------------------
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// TESTRESPONSE[s/"took": 11/"took": $body.took/]
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// TESTRESPONSE[s/"_shards": \.\.\./"_shards": $body._shards/]
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// TESTRESPONSE[s/"hits": \.\.\./"hits": $body.hits/]
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<1> `keys` is an array of strings since the maximum value may be present in multiple buckets
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