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# Children Aggregation
> More info about children aggregation is in the [official elasticsearch docs][1]
A special single bucket aggregation that enables aggregating from buckets on parent
document types to buckets on child documents.
## Simple example
```JSON
{
"aggregations": {
"author_count": {
"children": {
"type": "answer"
},
"aggregations": {
"top_names": {
"terms": {
"field": "owner.display_name"
}
}
}
}
}
}
```
And now the query via DSL:
```php
$termsAggregation = new TermsAggregation('top_names', 'owner.display_name');
$childrenAggregation = new ChildrenAggregation('author_count', 'answer');
$childrenAggregation->addAggregation($termsAggregation);
$search = new Search();
$search->addAggregation($childrenAggregation);
$queryArray = $search->toArray();
```
[1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-children-aggregation.html
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