Apache Lucene 2.2.0

Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java.
Apache Lucene is a technology suitable for nearly any application that requires full-text search, especially cross-platform.
Enhancements:
- Many new features, optimizations, and bugfixes have been added since 2.1.0, including "point-in-time" searching over NFS, payloads, function queries, and new APIs for pre-analyzed fields.
- This release includes index format changes that are not readable by older versions.
- It can both read and update older Lucene indexes.
- Adding to an index with an older format will cause it to be converted to the newer format.