Book Image

Elasticsearch 5.x Cookbook - Third Edition

By : Alberto Paro
Book Image

Elasticsearch 5.x Cookbook - Third Edition

By: Alberto Paro

Overview of this book

Elasticsearch is a Lucene-based distributed search server that allows users to index and search unstructured content with petabytes of data. This book is your one-stop guide to master the complete Elasticsearch ecosystem. We’ll guide you through comprehensive recipes on what’s new in Elasticsearch 5.x, showing you how to create complex queries and analytics, and perform index mapping, aggregation, and scripting. Further on, you will explore the modules of Cluster and Node monitoring and see ways to back up and restore a snapshot of an index. You will understand how to install Kibana to monitor a cluster and also to extend Kibana for plugins. Finally, you will also see how you can integrate your Java, Scala, Python, and Big Data applications such as Apache Spark and Pig with Elasticsearch, and add enhanced functionalities with custom plugins. By the end of this book, you will have an in-depth knowledge of the implementation of the Elasticsearch architecture and will be able to manage data efficiently and effectively with Elasticsearch.
Table of Contents (25 chapters)
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Introduction


Elasticsearch has a powerful way to extend its capabilities with custom scripts that can be written in several programming languages. The most common ones are Painless, Groovy, JavaScript, and Python.

In this chapter, we will see how it's possible to create custom scoring algorithms, special processed return fields, custom sorting, and complex update operations on records.

The scripting concept of Elasticsearch is an advanced stored procedures system in the NoSQL world; so, for an advanced use of Elasticsearch, it is very important to master it.

Elasticsearch natively provides scripting in Java (a Java code compiled in JAR), Painless, Groovy, Express, and Mustache; but a lot of interesting languages are available as plugins, such as JavaScript and Python.

In older Elasticsearch releases, prior to version 5.0, the official scripting language was Groovy, but for better sandboxing and performance, the official language is now Painless, which is provided by default in Elasticsearch...