An open source enterprise search platform, written in Java. Its major features include full text research, hit highlighting, faceted research, real time indexing, dynamic clustering and database integration. Providing distributed search and index replication, Solr is designed for scalability and fault tolerance. Solr is widely used for enterprise search and analytics use cases and has an active development community and regular releases.
Elasticsearch is a search engine based on Lucene. It provides a distributed, multitenant-capable full-text search with an HTTP web interface and schema-free JSON documents. Elasticsearch is developed alongside a data-collection and log-parsing engine called Logstash, and an analytics and visualization platform called Kibana. The products are designed for use as an integrated solution, referred to as the "Elastic Stack".