How to get nested aggregations buckets using java high level REST client Elasticsearch

Question

I have some nested fields, of which I want to calculate all distinct values, for example:

\"author\":{
  \"type\":\"nested\",
  \"properties\":{
    \"first_name         


        

Answer 1

Try this (not tested):

Nested distinct_authornames=aggregations.get("distinct_authors");
Terms distinct_first_names=distinct_authornames.getAggregations().get("distinct_first_names");

for (Terms.Bucket bucket : distinct_first_names.getBuckets()) 
{
    System.out.println((int) bucket.getDocCount());
    System.out.println(bucket.getKeyAsString());
}

Hope this helps

Answer 2

Figured out the solution, quite long time back , but didn't realise it was working because I kept getting exception , due to some other reason. The following works well :

Nested distinct_authorsOuter=aggregations.get("distinct_authors");
            Aggregations distinct_authors_aggs=distinct_authorsOuter.getAggregations();

Terms distinct_firstNames= distinct_authors_aggs.get("distinct_first_names");