# apache/lucenenet

Apache Lucene.NET is an open-source full-text search library written in C#, ported from the Apache Lucene project.

Repository: https://github.com/apache/lucenenet
Canonical: https://ross.abutalabs.com/products/lucenenet
Homepage: https://lucenenet.apache.org/
Language: C#
License: Apache-2.0
License Family: permissive
Topics: lucenenet, lucene, text, search, information, retrieval, analysis, index, query, apache, hacktoberfest
Last push: 2026-08-09T21:24:26+00:00

## Health v2 (maintenance only)
Score: 83/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 96, release rhythm 57, longevity 100
- inputs: {"age_days": 6368, "days_push": 24, "days_rel": 72, "gap_med": 601, "n_releases_24m": 2}
- flags: prerelease_only
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2406, forks 658 (observed 2026-08-28T04:06:44.165822+00:00)

## What it is
Apache Lucene.NET is an open-source full-text search library written in C#, ported from the Java Apache Lucene project. It provides powerful indexing and search features, plus spellchecking, hit highlighting, and advanced text analysis/tokenization capabilities.

## Use cases
- add full-text search to a .NET application
- build an inverted index over documents in C#
- implement ranked keyword and phrase queries
- add spellchecking and did-you-mean suggestions
- highlight search hits in results
- tokenize and analyze text with configurable analyzers

## When to choose
- you need high-performance embedded full-text search in a .NET app without running a separate search server
- you want Lucene's mature indexing and query features on .NET
- you need fine-grained control over analyzers, tokenizers, and indexing

## When to avoid
- you want a turnkey distributed search cluster with REST APIs (use Elasticsearch or Solr)
- you need a stable non-beta release of the 4.x feature set, since 4.8.0 is still beta
- your project is not on the .NET platform

## Facets
- artifact type: library
- maturity: active
- function: search-engine, parser, nlp
- domain: developer-tools
- platform: dotnet, cross-platform, windows
- tags: full-text-search, indexing, lucene, c-sharp, tokenization, spellchecking, hit-highlighting, search, natural-language-processing, linux, macos

## Member repositories
- apache/lucenenet (main) score 83

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:44.165822+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:34:06.207468+00:00, confidence not recorded.
  - readme: https://github.com/apache/lucenenet (fetched 2026-08-28T04:06:44.165822+00:00, sha c5f187b09297)
  - homepage: https://lucenenet.apache.org/ (fetched 2026-08-29T10:14:21.334783+00:00, sha 7f63ec4807e8)
  - site_page: https://lucenenet.apache.org/docs.html (fetched 2026-08-29T10:14:21.343819+00:00, sha 35737d5621aa)
- Data as of 2026-08-30T08:39:29.467469+00:00.