Elasticsearch

Elasticsearch is a distributed, RESTful search and analytics engine capable of addressing a growing number of use cases. Built on Apache Lucene, it provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. It's the heart of the Elastic Stack.

• Full-text search with relevance scoring
• Distributed architecture and clustering
• Real-time data ingestion and indexing
• Powerful aggregations and analytics
• Multi-tenancy and security features
• RESTful API and JSON documents
• Machine learning capabilities
• Geospatial and time-series support

• Application and website search
• Log and event data analysis
• Business intelligence and analytics
• Security information and event management
• E-commerce product search
• Real-time application monitoring
• Geospatial data analysis
• Machine learning and AI applications

• Apache Solr
• Amazon CloudSearch
• Algolia
• Sphinx