SOLR

Apache Solr is an open-source search platform built on the Apache Lucene library. The platform is written in Java. It is used to index, search and analyze large amounts of data in near real-time. Solr supports text search, faceted search, geospatial search, real-time indexing, dynamic clustering, database integration, NoSQL features, and more. It also provides a rich set of features such as hit highlighting, spell-checking, and result grouping. Solr is widely used for enterprise search, e-commerce search, and log analytics. It can be integrated with a wide variety of data sources and can be easily scaled horizontally to handle large amounts of data and traffic.