Executing a search with aggregations

The previous recipe can be extended to support aggregations and to retrieve analytics on indexed data.

Getting ready

You will need a working ElasticSearch cluster and a working copy of Maven.

The code of this recipe is in chapter_10/nativeclient folder in the code bundle of this chapter available on Packt's website, and on GitHub (https://github.com/aparo/elasticsearch-cookbook-second-edition). The referred class is AggregationExample.

How to do it...

To execute a search with aggregations, we will perform the following steps:

1. We'll calculate two different aggregations (terms and extended statistics) as follows:

   import org.elasticsearch.action.search.SearchResponse;
   import org.elasticsearch.client.Client;
   import org.elasticsearch.search.aggregations.AggregationBuilder;
   import org.elasticsearch.search.aggregations.bucket.terms.Terms;
   import org.elasticsearch.search.aggregations.metrics.stats.extended.ExtendedStats;
   import org.elasticsearch.search.aggregations...