What you need for this book

This book was written using ElasticSearch server 0.20.0, and all the examples and functions should work with it. In addition to that, you'll need a command that allows sending HTTP requests such as curl, which is available for most operating systems. Please note that all examples in this book use the mentioned curl tool. If you want to use another tool, please remember to format the request in an appropriate way that is understood by the tool of your choice.

In addition to that, some chapters may require additional software, such as ElasticSearch plugins or MongoDB NoSQL database, but when needed this is explicitly mentioned.