Book Image

Elasticsearch 7 Quick Start Guide

By : Anurag Srivastava, Douglas Miller
Book Image

Elasticsearch 7 Quick Start Guide

By: Anurag Srivastava, Douglas Miller

Overview of this book

Elasticsearch is one of the most popular tools for distributed search and analytics. This Elasticsearch book highlights the latest features of Elasticsearch 7 and helps you understand how you can use them to build your own search applications with ease. Starting with an introduction to the Elastic Stack, this book will help you quickly get up to speed with using Elasticsearch. You'll learn how to install, configure, manage, secure, and deploy Elasticsearch clusters, as well as how to use your deployment to develop powerful search and analytics solutions. As you progress, you'll also understand how to troubleshoot any issues that you may encounter along the way. Finally, the book will help you explore the inner workings of Elasticsearch and gain insights into queries, analyzers, mappings, and aggregations as you learn to work with search results. By the end of this book, you'll have a basic understanding of how to build and deploy effective search and analytics solutions using Elasticsearch.
Table of Contents (10 chapters)

Pipeline aggregations

Pipeline aggregations return outputs from other aggregations, and add information to the output tree. There are two families of aggregation:

  • Parent aggregations: Pipeline aggregations that take the output from the parent aggregation and compute new buckets or aggregations to add to the existing buckets
  • Sibling aggregations: Pipeline aggregations that take the output from a sibling aggregation and compute new buckets or aggregations to add to the existing buckets

The pipeline aggregations use buckets_path to reference the aggregations. This allows the pipelines to be chained. The syntax for the path is as follows:

PATH = <AGG_NAME>[<AGG_SEPARATOR>,<AGG_NAME>]*[<METRIC_SEPARATOR>, <METRIC>];

Here, the parameters are as follows:

  • AGG_NAME: Represents the name of the aggregation
  • AGG_SEPARATOR: Represents the separator of the aggregation...