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)

Chapter 6: Relationships and Geo Queries

In this chapter, we will explore special queries that can be used to search for relationships between Elasticsearch and geolocation documents.

When we have a parent-child relationship (based on a join field mapping), we can use special queries to query for a similar relationship. Elasticsearch doesn't provide a SQL join, but it lets you search child/parent-related documents; it makes it possible to retrieve child documents via parent selection or by matching parent documents and filtering them by their children. Elasticsearch is very powerful tool and can help resolve many common data relationship issues. It is also used to easily solve issues in traditional relational databases. These features, in my experience, aren't popular among new Elasticsearch users but are valuable if you manage intelligence data sources.

In this chapter, we will also look at how to query nested objects using...