What you need for this book

You need a stable version of Elasticsearch. The code of the book is compatible with Elasticsearch version 1 and later. You can examine the code of the book using cURL (that is, Client URL Library) on Linux and MacOS X. Plus, if you need a user-friendly query interface, you can use the sense plugin running on Chrome (https://chrome.google.com/webstore/detail/sense-beta/lhjgkmllcaadmopgmanpapmpjgmfcfig?hl=en).