Returning inner hits in results
In Elasticsearch, when using nested and child documents, we can have complex data models. By default, Elasticsearch only returns documents that match the searched type and not the nested or children ones that match the query.
The inner_hits function was introduced in Elasticsearch 5.x to provide this functionality.
Getting ready
You will need an up-and-running Elasticsearch installation, as described in the Downloading and installing Elasticsearch recipe of 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. I suggest using the Kibana console 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.txt command, which is available in the online code.
