This book was written using Elasticsearch server Version 1.0.0, and all the examples and functions should work with it. In addition to this, you'll need a command that allows you to send HTTP requests such as cURL, which is available for most operating systems. Please note that all the 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 can be understood by the tool of your choice.
In addition to this, some chapters may require additional software such as Elasticsearch plugins, but it has been explicitly mentioned when certain types of software are needed.