Returning inner hits in results

In Elasticsearch, when using nested and child documents, we can have complex data models. Elasticsearch, by default, returns only documents that match the searched type and not the nested or children one that matches the query.

The inner_hits function was introduced in Elasticsearch 5.x to provide this functionality.

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. I suggest using the Kibana console as it provides code completion...