Elasticsearch

About Elasticsearch

Elasticsearch is a distributed, open-source search and analytics engine built on Apache Lucene, developed by Elastic N.V. and first released in 2010. It is the most widely used search engine in the world, powering full-text search, log analytics, application performance monitoring, and security information management across thousands of companies. Elasticsearch stores data as JSON documents in indices and enables real-time indexing and search across billions of documents with near-instant response times. The ELK Stack (Elasticsearch, Logstash, Kibana) became an industry standard for centralized log management: Logstash ingests and transforms logs, Elasticsearch indexes and searches them, and Kibana provides dashboards and visualizations. Elastic introduced Beats (lightweight shippers) to create the Elastic Stack. Key use cases include e-commerce search (Walmart, GitHub), log monitoring (Netflix, LinkedIn), geospatial search, and security analytics (SIEM). Elasticsearch runs on-premises or as Elastic Cloud (managed service) and is available on AWS (OpenSearch), Google Cloud, and Azure. In 2021, Elastic changed its license from Apache 2.0 to the Server Side Public License, prompting AWS to fork Elasticsearch as OpenSearch. Elasticsearch clusters scale horizontally by adding nodes and automatically shard data across them. For teams needing powerful search-as-a-service with less operational overhead, Algolia and Typesense are popular alternatives.