Apache Lucene

Doug Cutting originally wrote Lucene in 1999. Lucene was his fifth search engine. He had previously written two while at Xerox PARC, one at Apple, and a fourth at Excite. It was initially available for download from its home at the SourceForge web site. It joined the Apache Software Foundation's Jakarta family of open-source Java products in September 2001 and became its own top-level Apache project in February 2005. The name Lucene is Doug Cutting's wife's middle name and her maternal grandmother's first name. Lucene formerly included a number of sub-projects, such as Lucene.NET, Mahout, Tika and Nutch. These three are now independent top-level projects. In March 2010, the Apache Solr search server joined as a Lucene sub-project, merging the developer communities. Version 4.0 was released on October 12, 2012. In March 2021, Lucene changed its logo, and Apache Solr became a top level Apache project again, independent from Lucene. ==Features and common use==

While suitable for any application that requires full text indexing and searching capability, Lucene is recognized for its utility in the implementation of Internet search engines and local, single-site searching. Lucene includes a feature to perform a fuzzy search based on edit distance. Lucene has also been used to implement recommendation systems. For example, Lucene's 'MoreLikeThis' Class can generate recommendations for similar documents. In a comparison of the term vector-based similarity approach of 'MoreLikeThis' with citation-based document similarity measures, such as co-citation and co-citation proximity analysis, Lucene's approach excelled at recommending documents with very similar structural characteristics and more narrow relatedness. In contrast, citation-based document similarity measures tended to be more suitable for recommending more broadly related documents, meaning citation-based approaches may be more suitable for generating serendipitous recommendations, as long as documents to be recommended contain in-text citations. ==Lucene-based projects==

Lucene itself is just an indexing and search library and does not contain crawling and HTML parsing functionality. However, several projects extend Lucene's capability: • Apache Nutch – provides web crawling and HTML parsing • Apache Solr – an enterprise search server • CrateDB – open source, distributed SQL database built on Lucene • DocFetcher – a multiplatform desktop search application • Elasticsearch – an enterprise search server released in 2010 • Kinosearch – a search engine written in Perl and C and a loose port of Lucene. The Socialtext wiki software uses this search engine, It is also used by the Human Metabolome Database (HMDB) and the Toxin and Toxin-Target Database (T3DB). • MongoDB Atlas Search – a cloud-native enterprise search application based on MongoDB and Apache Lucene • OpenSearch – an open source enterprise search server based on a fork of Elasticsearch 7 • Swiftype – an enterprise search startup based on Lucene ==See also==