Executing a terms aggregation
The most used bucket aggregation is the terms one, which groups the documents into buckets based on a single term value. This aggregation is often used to narrow down the search using the computed values as filters for the queries.
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 the 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 ch07/populate_aggregation.sh commands available in the online code.
The index that’s used in this recipe is index-agg.
How to do it...
To execute a terms aggregation, we will perform the following...
