Executing a global aggregation
The aggregations are generally executed on query search results; Elasticsearch provides a special aggregation, global, that is executed globally on all the documents without being influenced by the query.
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 used in this recipe is index-agg.
How to do it...
To execute global aggregations, we will perform the following steps:
- Compare a global...
