Managing a child document with a join field

In the previous recipe, we have seen how it's possible to manage relations between objects with the nested object type. The disadvantage of nested objects is their dependence from their parent. If you need to change a value of a nested object, you need to reindex the parent (this brings a potential performance overhead if the nested objects change too quickly). To solve this problem, Elasticsearch allows you to define child documents.

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...