Elasticsearch was born as a search engine: its main purpose is to process queries and give results.
In this recipe, we'll see that a search in Elasticsearch is not only limited to matching documents, but it can also calculate additional information required to improve the search quality.
You will need an up-and-running Elasticsearch installation as used in the Downloading and installing Elasticsearch recipe in Chapter 2, Downloading and Setup.
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.
The mapping used in all these chapter ...