October 2013, Apache Lucene™ 4.5 available
The Lucene PMC is pleased to announce the release of Apache Lucene 4.5

Apache Lucene is a high-performance, full-featured text search engine
library written entirely in Java. It is a technology suitable for nearly
any application that requires full-text search, especially cross-platform.

This release contains numerous bug fixes, optimizations, and
improvements, some of which are highlighted below. The release
is available for immediate download at:

See the CHANGES.txt file included with the release for a full list of

Lucene 4.5 Release Highlights:

* Added support for missing values to DocValues fields through AtomicReader.getDocsWithField.

* Lucene 4.5 has a new Lucene45Codec with Lucene45DocValues, supporting missing values and with most datastructures residing off-heap.

* New in-memory DocIdSet implementations which are especially better than FixedBitSet on small sets: WAH8DocIdSet, PFORDeltaDocIdSet and EliasFanoDocIdSet.

* CachingWrapperFilter now caches filters with WAH8DocIdSet by default, which has the same memory usage as FixedBitSet in the worst case but is smaller and faster on small sets.

* TokenStreams now set the position increment in end(), so we can handle trailing holes.

* IndexWriter no longer clones the given IndexWriterConfig.

* Various bugfixes and optimizations since the 4.4 release.

Please read CHANGES.txt for a full list of new features.

Please report any feedback to the mailing lists

Note: The Apache Software Foundation uses an extensive mirroring network
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may not have replicated the release yet.  If that is the case, please
try another mirror.  This also goes for Maven access.
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