Apache Solr is an enterprise search platform built on Apache Lucene. It provides a standalone search server for indexing documents, retrieving information and managing search applications through HTTP interfaces.
Solr is suitable for website search, document repositories, product catalogues and applications requiring advanced relevance ranking. It supports structured fields alongside full-text content, allowing developers to combine keyword searches with filters, sorting and analytical facets.
The platform provides a configurable schema system for defining field types and text analysis behaviour. Developers can adjust how documents are tokenised, indexed and queried, including language-specific processing and synonym handling.
For distributed deployments, SolrCloud coordinates collections across multiple nodes. Sharding and replication allow search workloads to scale and help maintain availability when individual nodes fail.
Solr also includes administration and monitoring interfaces for inspecting indexes, examining query behaviour and managing search collections.
This is free and open source software.
Key Features
- Full-text indexing and relevance-ranked document retrieval.
- HTTP APIs supporting JSON-based document indexing and querying.
- Configurable schemas, field types and dynamic fields.
- Text analysis pipelines with tokenisation, stemming and synonyms.
- Boolean, phrase, proximity, range and fuzzy queries.
- Faceted navigation with field, range and query facets.
- JSON Facet API with statistical aggregations and nested facets.
- Result highlighting, spell checking and query suggestions.
- Function queries and configurable relevance ranking.
- Dense vector fields and nearest-neighbour similarity search.
- SolrCloud for distributed collections, sharding and replication.
- Automatic leader election, failover and recovery.
- Index administration, statistics and query debugging interfaces.
- Cross-platform support – runs on Linux, macOS, and Windows.
Website: solr.apache.org
Support:
Developer: Apache Software Foundation
License: Apache License 2.0
Apache Solr is written in Java. Learn Java with our recommended free books and free tutorials.
Related Software
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| Typesense | Fast, typo-tolerant search engine |
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| ParadeDB | PostgreSQL extension adding search and analytical capabilities to Postgres |
| Vespa | AI search platform |
| Mroonga | MySQL storage engine based on the Groonga search engine |
| PGroonga | Adds a Groonga-powered index access method |
| Groonga | Fulltext search engine and column store |
Read our verdict in the software roundup.
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