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# Sum Aggregation
> More info about sum aggregation is in the [official elasticsearch docs][1]
A single-value metrics aggregation that sums up numeric values that are extracted from the aggregated documents.
## Simple example
```JSON
{
"aggregations" : {
"intraday_return" : { "sum" : { "field" : "change" } }
}
}
```
And now the query via DSL:
```php
$sumAggregation = new SumAggregation('intraday_return', 'change');
$search = new Search();
$search->addAggregation($sumAggregation);
$queryArray = $search->toArray();
```
[1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-sum-aggregation.html
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