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

Your ElasticSearch time machine


Apart from our indices and the data indexed inside them, ElasticSearch needs to hold the metadata, which can be of the type mappings, index-level settings, and all of that. All that information needs to be stored somewhere in order to be safe when the whole cluster restarts. It is due to these needs that ElasticSearch introduced the gateway module. You can think about it as a safe haven for your cluster data and metadata. Each time you start your cluster, all the needed data is read from the gateway, and when you make a change to your cluster it is persisted using the gateway module.

The gateway module

ElasticSearch allows us to use different gateway types, which we will discuss in a moment. In order to set the type of gateway we want to use, we need to add the gateway.type property to the elasticsearch.yml configuration file and set it to one of the following values:

  • local: This specifies a local gateway

  • fs: This specifies a shared filesystem gateway

  • hdfs...