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From Adrien Grand <>
Subject [ANNOUNCE] Apache Lucene 4.5 released
Date Sat, 05 Oct 2013 09:44:06 GMT
October 2013, Apache Luceneā„¢ 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

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

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

* 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
for distributing releases.  It is possible that the mirror you are using
may not have replicated the release yet.  If that is the case, please
try another mirror.  This also goes for Maven access.

Adrien Grand

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