Book Image

ElasticSearch Cookbook

By : Alberto Paro
Book Image

ElasticSearch Cookbook

By: Alberto Paro

Overview of this book

ElasticSearch is one of the most promising NoSQL technologies available and is built to provide a scalable search solution with built-in support for near real-time search and multi-tenancy. This practical guide is a complete reference for using ElasticSearch and covers 360 degrees of the ElasticSearch ecosystem. We will get started by showing you how to choose the correct transport layer, communicate with the server, and create custom internal actions for boosting tailored needs. Starting with the basics of the ElasticSearch architecture and how to efficiently index, search, and execute analytics on it, you will learn how to extend ElasticSearch by scripting and monitoring its behaviour. Step-by-step, this book will help you to improve your ability to manage data in indexing with more tailored mappings, along with searching and executing analytics with facets. The topics explored in the book also cover how to integrate ElasticSearch with Python and Java applications. This comprehensive guide will allow you to master storing, searching, and analyzing data with ElasticSearch.
Table of Contents (19 chapters)
ElasticSearch Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Creating a cluster action


In the previous recipe, we saw how to create a REST entry point, but to execute the action at cluster level we need to create a cluster action.

An ElasticSearch action is generally executed and distributed in the cluster and in this recipe, we will see how to implement these kinds of actions. The cluster action will be very bare, we will be sending a string with a value for every shard and these strings echo a result string concatenating the string with the shard number.

Getting ready

You need a working ElasticSearch node, a Maven built tool, and an optional Java IDE. The code of this recipe is available in the chapter12/rest_plugin directory.

How to do it...

In this recipe, we have seen that a REST call is converted to an internal cluster action.

To execute an internal cluster action, the following classes are required:

  • A Request and Response class to communicate with the cluster.

  • A RequestBuilder class used to execute a request to the cluster.

  • An Action class used to register...