The most used bucket aggregation is the terms one. It groups the documents in 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.
You need an up-and-running Elasticsearch installation, as we described in the Downloading and installing Elasticsearch recipe in Chapter 2, Downloading and Setup.
curl via the command line, you need to install
curl for your operative system.
To correctly execute the following command, you need an index populated with the
chapter_08/populate_aggregations.sh script available in the online code.
For executing a term aggregation, we will perform the following steps: ...