Solr

• Website: https://solr.apache.org/
• Category: Vector Database Engines
• Tags: open-source, vector-search, hybrid-search, enterprise

Description

Solr is an open-source, multi-modal search platform built on Apache Lucene™. It supports full-text, vector, and geospatial search, and is designed for high reliability, scalability, and fault tolerance. Solr is widely used for powering search and navigation features in large-scale websites and applications.

Features

• Full-text search capabilities
• Vector search support for modern retrieval methods
• Hybrid search (combining keyword and vector search)
• Geospatial search
• Distributed indexing and search (SolrCloud)
• Replication and load-balanced querying
• Automated failover and recovery
• Centralized configuration management
• Faceting and advanced filtering
• Real-time indexing
• Pluggable architecture for extensions and plugins
• Advanced statistics and aggregations
• Rich content handling (integration with tools like Apache Tika)
• Spatial (geolocation) search features
• Detailed query and index management APIs
• Docker and Kubernetes deployment options
• Web-based user interface for management

Pricing

Solr is open-source software licensed under the Apache License, Version 2.0, and is free to use.