Executing a children aggregation
Children aggregation allows you to execute analytics based on parent documents and child documents. When working with complex structures, nested objects are very common.
Getting ready
You need an up and running Elasticsearch installation, as we described in the Downloading and installing Elasticsearch recipe in Chapter 1, Getting Started.
To execute these commands, any HTTP client can be used, such as cURL (https://curl.haxx.se/), Postman (https://www.getpostman.com/), or similar. Using Kibana Console is recommended, as it provides code completion and better character escaping for Elasticsearch.
To correctly execute the following commands, you will need an index populated with the ch04/populate_kibana.sh commands available in the online code.
The index used in this recipe is mybook-join.
How to do it...
To execute children aggregations, we will perform the following steps:
- Index documents with child or parent relations,...
