Apache Solr

Apache Solr is an open‑source search platform built on Apache Lucene that supports full‑text, vector, and geospatial queries. It provides real‑time indexing, hit highlighting, faceted navigation, dynamic clustering, and the ability to ingest rich document formats such as Word and PDF. The system is designed for high reliability and scalability, offering distributed indexing, replication, load‑balanced querying, automated failover, and centralized configuration.

The software is aimed at enterprises and developers who need a self‑hosted, fault‑tolerant search solution that can handle large volumes of data and diverse query types. It is used by many high‑traffic web sites and applications to power search and navigation features, and it can be deployed via Docker or Kubernetes using the official images and Solr Operator.

Solr is released under the Apache 2.0 license, is maintained by the Apache Software Foundation, and includes extensive documentation, tutorials, and community support channels such as mailing lists, Slack, and IRC.