Executing global aggregations

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 2, Downloading and Setup.

To execute 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 script (chapter_08/populate_aggregations.sh) available in the online code.

How to do it...

For executing global aggregations, we will perform the following steps:

1. We want compare a global average with a query one; the g:

           curl -XGET 'http://127.0.0.1:9200/test-incall will be something similar to the following:
           curl -XGET 'http://127.0.0.1:9200/test-index/test-type/_search? 
           size=0&pretty'...