It is often required to return only the count of the matched results and not the results themselves.
There are a lot of scenarios involving counting, such as the following:
To return the number of something (how many posts for a blog, how many comments for a post)
Validating whether some items are available. Are there posts? Are there comments?
You will need an up-and-running Elasticsearch installation as used in the Downloading and installing Elasticsearch recipe in Chapter 2, Downloading and Setup.
To execute curl
via a command line, you need to install curl
for your operating system.
To correctly execute the following commands, you will need an index populated with the chapter_05/populate_query.sh
script available in the online code.