Book Image

ElasticSearch Server

Book Image

ElasticSearch Server

Overview of this book

ElasticSearch is an open source search server built on Apache Lucene. It was built to provide a scalable search solution with built-in support for near real-time search and multi-tenancy.Jumping into the world of ElasticSearch by setting up your own custom cluster, this book will show you how to create a fast, scalable, and flexible search solution. By learning the ins-and-outs of data indexing and analysis, "ElasticSearch Server" will start you on your journey to mastering the powerful capabilities of ElasticSearch. With practical chapters covering how to search data, extend your search, and go deep into cluster administration and search analysis, this book is perfect for those new and experienced with search servers.In "ElasticSearch Server" you will learn how to revolutionize your website or application with faster, more accurate, and flexible search functionality. Starting with chapters on setting up your own ElasticSearch cluster and searching and extending your search parameters you will quickly be able to create a fast, scalable, and completely custom search solution.Building on your knowledge further you will learn about ElasticSearch's query API and become confident using powerful filtering and faceting capabilities. You will develop practical knowledge on how to make use of ElasticSearch's near real-time capabilities and support for multi-tenancy.Your journey then concludes with chapters that help you monitor and tune your ElasticSearch cluster as well as advanced topics such as shard allocation, gateway configuration, and the discovery module.
Table of Contents (17 chapters)
ElasticSearch Server
Credits
About the Authors
Acknowledgement
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

Percolator


Did you ever wonder what would happen if we reversed the traditional model of using queries to find documents? Does it make sense to find documents that match the queries? It's no surprise that there is an entire range of solutions where this model is very useful. Wherever you operate on unbounded streams of input data, where you search for occurrences of particular events, you can use this approach. This can be the detection of failures in a monitoring system or a "tell me when this product with defined criteria will be available in this shop" functionality. Let's see how the ElasticSearch percolator works and how it can handle this last example.

Preparing the percolator

The percolator looks like an additional index in ElasticSearch. This means that we can store any documents in it and obtain its mappings. We can also search it like an ordinary index. However, we spoke about the reversal of the standard behavior and treating queries as documents. Let's get the library example from...