Book Image

Advanced Elasticsearch 7.0

By : Wai Tak Wong
Book Image

Advanced Elasticsearch 7.0

By: Wai Tak Wong

Overview of this book

Building enterprise-grade distributed applications and executing systematic search operations call for a strong understanding of Elasticsearch and expertise in using its core APIs and latest features. This book will help you master the advanced functionalities of Elasticsearch and understand how you can develop a sophisticated, real-time search engine confidently. In addition to this, you'll also learn to run machine learning jobs in Elasticsearch to speed up routine tasks. You'll get started by learning to use Elasticsearch features on Hadoop and Spark and make search results faster, thereby improving the speed of query results and enhancing the customer experience. You'll then get up to speed with performing analytics by building a metrics pipeline, defining queries, and using Kibana for intuitive visualizations that help provide decision-makers with better insights. The book will later guide you through using Logstash with examples to collect, parse, and enrich logs before indexing them in Elasticsearch. By the end of this book, you will have comprehensive knowledge of advanced topics such as Apache Spark support, machine learning using Elasticsearch and scikit-learn, and real-time analytics, along with the expertise you need to increase business productivity, perform analytics, and get the very best out of Elasticsearch.
Table of Contents (25 chapters)
Free Chapter
Section 1: Fundamentals and Core APIs
Section 2: Data Modeling, Aggregations Framework, Pipeline, and Data Analytics
Section 3: Programming with the Elasticsearch Client
Section 4: Elastic Stack
Section 5: Advanced Features

Overview of Elasticsearch Java REST client

You will recall that in the Talking to Elasticsearch section in Chapter 1, Overview of Elasticsearch 7, we discussed that Elasticsearch officially supports two protocols only. They are HTTP (the RESTful API) and native. When using the Java language, the transport client was the preferred method of the native protocol. However, transport clients such as the Java API are deprecated in Elasticsearch 7.0, and completely removed in 8.0. In short, we should use the Java high-level REST client. According to the Elasticsearch client in the Maven repository (available at, we can sketch the hierarchy of the group ID and artifact ID, as shown in the following diagram:

Because the length of the chapter is limited, we are only focusing on two artifacts, elasticsearch-rest-high-level-client...