Using nested queries

For queries based on nested objects, there is a special nested query.

This kind of query is required because nested objects are indexed in a special way in Elasticsearch.

Getting ready

You need an up-and-running Elasticsearch installation as we described in the Downloading and installing Elasticsearch recipe in Chapter 2, Downloading and Setup.

To execute curl via the command line, you need to install curl for your operating system.

To correctly execute the following commands, you need an index populated with the chapter_07/populate_relations.sh script, available in the online code.

How to do it...

To execute the nested query, we will perform the following steps:

1. We want to search the document for nested objects that are blue and whose size is greater than 10. The nested query will be as follows:

           curl -XPOST 'http://127.0.0.1:9200/test-index/test- 
           type/_search?pretty=true' -d '{
           "query": {
               "nested" : {
                   ...