Yes, Elasticsearch is a free, open source software. You can run Elasticsearch on-premises, on Amazon EC2, or on Amazon Elasticsearch Service. With on-premises or Amazon EC2 deployments, you are responsible for installing Elasticsearch and other necessary software, provisioning infrastructure, and managing the cluster. Amazon Elasticsearch Service, on the other hand, is a fully managed service, so you don’t have to worry about time-consuming cluster management tasks such as hardware provisioning, software patching, failure recovery, backups, and monitoring. , Elasticsearch scales effortlessly, as long as your users play within the rules. You need to know how to set up a stable cluster before going into production, and then be able to recognize the warning signs at three in the morning in order to prevent catastrophe. The earlier chapters may be of less interest to you, but the last part of the book is essential reading—all you need to know to avoid meltdown., Elasticsearch is an open-source, RESTful, distributed search and analytics engine built on Apache Lucene. Since its release in 2010, Elasticsearch has quickly become the most popular search engine, and is commonly used for log analytics, full-text search, security intelligence, business analytics, and operational intelligence use cases..