(Lucene is a sub project of the 4jakarta project team of the Apache Software Foundation. It is an open source full-text search engine toolkit. That is, it is not a complete full-text search engine, but a full-text search engine architecture. It provides a complete query engine, index engine, and part of the text analysis engine (English and German are two western languages). Lucene's goal is to provide software developers with an easy-to-use toolkit)