Here are some highlights from the change log:
- Added support for stored compressed fields
- Added support for binary stored fields
- Add ParallelReader, an IndexReader that combines separate indexes over different fields into a single virtual index
- Added class org.apache.lucene.index.IndexModifier which combines IndexWriter and IndexReader, so you can add and delete documents without worrying about synchronisation/locking issues.
- Added regular expression queries, RegexQuery and SpanRegexQuery.