[[java-aggs-bucket-histogram]]
==== Histogram Aggregation

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


===== Prepare aggregation request

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

[source,java]
--------------------------------------------------
AggregationBuilder aggregation =
        AggregationBuilders
                .histogram("agg")
                .field("height")
                .interval(1);
--------------------------------------------------


===== Use aggregation response

Import Aggregation definition classes:

[source,java]
--------------------------------------------------
import org.elasticsearch.search.aggregations.bucket.histogram.Histogram;
--------------------------------------------------

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

// For each entry
for (Histogram.Bucket entry : agg.getBuckets()) {
    Long key = (Long) entry.getKey();       // Key
    long docCount = entry.getDocCount();    // Doc count

    logger.info("key [{}], doc_count [{}]", key, docCount);
}
--------------------------------------------------