OpenSearch/docs/java-api/aggregations/bucket/nested-aggregation.asciidoc

[[java-aggs-bucket-nested]]
==== Nested Aggregation

Here is how you can use
{ref}/search-aggregations-bucket-nested-aggregation.html[Nested Aggregation]
with Java API.


===== Prepare aggregation request

Here is an example on how to create the aggregation request:

[source,java]
--------------------------------------------------
AggregationBuilders
    .nested("agg", "resellers");
--------------------------------------------------


===== Use aggregation response

Import Aggregation definition classes:

[source,java]
--------------------------------------------------
import org.elasticsearch.search.aggregations.bucket.nested.Nested;
--------------------------------------------------

[source,java]
--------------------------------------------------
// sr is here your SearchResponse object
Nested agg = sr.getAggregations().get("agg");
agg.getDocCount(); // Doc count
--------------------------------------------------