Executing a pipeline aggregation
Elasticsearch allows you to define aggregations that are a mix of the results of other aggregations (for example, by comparing the results of two metric aggregations); these are pipeline aggregations.
They are very common when you need to compute results from different aggregations, such as statistics on results.
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 to create index-pipagg with the following command:
PUT /index-pipagg
{ “mappings”: {
“properties...
