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# Avg Bucket Aggregation
> More info about avg bucket aggregation is in the [official elasticsearch docs][1]
A sibling pipeline aggregation which calculates the (mean) average value of a specified metric in a
sibling aggregation. The specified metric must be numeric and the sibling aggregation must be a multi-bucket
aggregation.
## Simple example
```JSON
{
"aggs" : {
"sales_per_month" : {
"date_histogram" : {
"field" : "date",
"interval" : "month"
},
"aggs": {
"sales": {
"sum": {
"field": "price"
}
}
}
},
"avg_monthly_sales": {
"avg_bucket": {
"buckets_path": "sales_per_month>sales"
}
}
}
}
```
And now the query via DSL:
```php
$search = new Search();
$dateAggregation = new DateHistogramAggregation('sales_per_month', 'date', 'month');
$dateAggregation->addAggregation(
new SumAggregation('sales', 'price')
);
$search->addAggregation($dateAggregation);
$search->addAggregation(
new AvgBucketAggregation('avg_monthly_sales', 'sales_per_month>sales')
);
$aggArray = $search->toArray();
```
[1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-avg-bucket-aggregation.html
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