Elasticsearch is a real-time distributed and open source full-text search and analytics engine. It is used in Single Page Application (SPA) projects. Elasticsearch is an open source developed in Java and used by many big organizations around the world. It is licensed under the Apache license version Elasticsearch is an open source, distributed search and analytics engine built for speed, scale, and AI applications. As a retrieval platform, it stores structured, unstructured, and vector data in real time — delivering fast hybrid and vector search , powering observability and security analytics, and enabling AI-driven applications with high performance, accuracy, and relevance. Download Elasticsearch or the complete Elastic Stack (formerly ELK stack) for free and start searching and analyzing in minutes with Elastic . Learn Elasticsearch online at your own pace. Start today and improve your skills. Join millions of learners from around the world already learning on Udemy.