Executing a histogram aggregation
Elasticsearch numerical values can be used to process histogram data.
The histogram representation is a very powerful way to show data to end users, mainly using bar charts.
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...
Using the items populated with the script, we will calculate the following histogram aggregations:
- ...
