Executing a filter aggregation
Sometimes, we need to reduce the number of hits in our aggregation to satisfy a particular filter. To obtain this result, filter aggregation is used.
The filter is one of the simpler ways to manipulate the bucket when filtering out values.
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 these 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...
We need to compute two different filter...