[ANNOUNCE] Apache Lucene 3.4.0 released

[ANNOUNCE] Apache Lucene 3.4.0 released:

September 14 2011, Apache Lucene™ 3.4.0 available

The Lucene PMC is pleased to announce the release of Apache Lucene 3.4.0.

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:

  http://www.apache.org/dyn/closer.cgi/lucene/java (see note below).

If you are already using Apache Lucene 3.1, 3.2 or 3.3, we strongly
recommend you upgrade to 3.4.0 because of the index corruption bug on
OS or computer crash or power loss (LUCENE-3418), now fixed in 3.4.0.

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

Lucene 3.4.0 Release Highlights:

 * Fixed a major bug (LUCENE-3418) whereby a Lucene index could
   easily become corrupted if the OS or computer crashed or lost
   power.

 * Added a new faceting module (contrib/facet) for computing facet
   counts (both hierarchical and non-hierarchical) at search
   time (LUCENE-3079).

 * Added a new join module (contrib/join), enabling indexing and
   searching of nested (parent/child) documents using
   BlockJoinQuery/Collector (LUCENE-3171).

 * It is now possible to index documents with term frequencies
   included but without positions (LUCENE-2048); previously
   omitTermFreqAndPositions always omitted both.

 * The modular QueryParser (contrib/queryparser) can now create
   NumericRangeQuery.

 * Added SynonymFilter, in contrib/analyzers, to apply multi-word
   synonyms during indexing or querying, including parsers to read
   the wordnet and solr synonym formats (LUCENE-3233).

 * You can now control how documents that don't have a value on the
   sort field should sort (LUCENE-3390), using SortField.setMissingValue.

 * Fixed a case where term vectors could be silently deleted from the
   index after addIndexes (LUCENE-3402).

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.

Happy searching,

Apache Lucene/Solr Developers

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