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112 lines
3.2 KiB
Markdown
112 lines
3.2 KiB
Markdown
---
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navigation_title: "Min bucket"
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mapped_pages:
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- https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-min-bucket-aggregation.html
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---
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# Min bucket aggregation [search-aggregations-pipeline-min-bucket-aggregation]
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A sibling pipeline aggregation which identifies the bucket(s) with the minimum value of a specified metric in a sibling aggregation and outputs both the value and the key(s) of the bucket(s). The specified metric must be numeric and the sibling aggregation must be a multi-bucket aggregation.
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## Syntax [_syntax_17]
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A `min_bucket` aggregation looks like this in isolation:
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```js
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{
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"min_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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$$$min-bucket-params$$$
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| Parameter Name | Description | Required | Default Value |
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| --- | --- | --- | --- |
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| `buckets_path` | The path to the buckets we wish to find the minimum for (see [`buckets_path` Syntax](/reference/data-analysis/aggregations/pipeline.md#buckets-path-syntax) for more details) | Required | |
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| `gap_policy` | The policy to apply when gaps are found in the data (see [Dealing with gaps in the data](/reference/data-analysis/aggregations/pipeline.md#gap-policy) for more details) | Optional | `skip` |
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| `format` | [DecimalFormat pattern](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/text/DecimalFormat.html) for theoutput value. If specified, the formatted value is returned in the aggregation’s`value_as_string` property | Optional | `null` |
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The following snippet calculates the minimum of the total monthly `sales`:
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```console
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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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"min_monthly_sales": {
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"min_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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1. `buckets_path` instructs this min_bucket aggregation that we want the minimum value of the `sales` aggregation in the `sales_per_month` date histogram.
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And the following may be the response:
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```console-result
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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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"min_monthly_sales": {
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"keys": ["2015/02/01 00:00:00"], <1>
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"value": 60.0
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}
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}
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}
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```
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1. `keys` is an array of strings since the minimum value may be present in multiple buckets
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