Book Image

Elasticsearch 8.x Cookbook - Fifth Edition

By : Alberto Paro
Book Image

Elasticsearch 8.x Cookbook - Fifth Edition

By: Alberto Paro

Overview of this book

Elasticsearch is a Lucene-based distributed search engine at the heart of the Elastic Stack that allows you to index and search unstructured content with petabytes of data. With this updated fifth edition, you'll cover comprehensive recipes relating to what's new in Elasticsearch 8.x and see how to create and run complex queries and analytics. The recipes will guide you through performing index mapping, aggregation, working with queries, and scripting using Elasticsearch. You'll focus on numerous solutions and quick techniques for performing both common and uncommon tasks such as deploying Elasticsearch nodes, using the ingest module, working with X-Pack, and creating different visualizations. As you advance, you'll learn how to manage various clusters, restore data, and install Kibana to monitor a cluster and extend it using a variety of plugins. Furthermore, you'll understand how to integrate your Java, Scala, Python, and big data applications such as Apache Spark and Pig with Elasticsearch and create efficient data applications powered by enhanced functionalities and custom plugins. By the end of this Elasticsearch cookbook, you'll have gained in-depth knowledge of implementing the Elasticsearch architecture and be able to manage, search, and store data efficiently and effectively using Elasticsearch.
Table of Contents (20 chapters)

Reading data with Apache Spark

In Spark, you can read data from a lot of sources, but in general, with NoSQL data stores such as HBase, Accumulo, and Cassandra, you have a limited query subset, and you often need to scan all the data to read only what is required. Using Elasticsearch, you can retrieve a subset of documents that matches your Elasticsearch query, speeding up the data reading several-fold.

Getting ready

You need an up-and-running Elasticsearch installation, as we described in the Downloading and installing Elasticsearch recipe in Chapter 1, Getting Started.

You also need a working installation of Apache Spark and the data that we indexed in the previous example.

How to do it...

To read data in Elasticsearch via Apache Spark, we will perform the following steps:

  1. In the Spark root directory, start the Spark shell to apply the Elasticsearch configuration by running the following command:
    ./bin/spark-shell \
        --conf spark.es.index...