LUCENE-SPEC

Apache Java search library.

Definition

Lucene inverted index, segmented with tiered merging policy. Components: Document, Field, Analyzer (tokenisation, stemming, stopwords), IndexWriter, IndexSearcher, Query (TermQuery, BooleanQuery, PhraseQuery, FuzzyQuery, SpanQuery). BM25 scoring default (since Lucene 6.0, formerly TF-IDF). Versions: v9.x (Java 11+), v10 in progress.

Origin

Lucene created 1999 by Doug Cutting ; joined Apache Jakarta 2001 ; standalone Apache Project 2005.

Example in context

Solr 9.x relies on Lucene 9.x ; a Lucene IndexWriter inserts docs, IndexSearcher answers Queries in O(log n) on the index.

Related terms

• BM25 — scoring algorithm.