[ANNOUNCE] Apache Lucene 5.4.0 released

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[ANNOUNCE] Apache Lucene 5.4.0 released

Malcolm Upayavira Holmes
14 December 2015, Apache Lucene™ 5.4.0 available
The Lucene PMC is pleased to announce the release of Apache Lucene 5.4.0

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://lucene.apache.org/core/mirrors-core-latest-redir.html

Please read CHANGES.txt for a full list of new features and changes:
  https://lucene.apache.org/core/5_4_0/changes/Changes.html

Lucene 5.4.0 Release Highlights:

API Changes
 * Query.getBoost and Query.setBoost are deprecated in favour of the
   new BoostQuery
 * The Filter class is deprecated in favour of FILTER clauses in a
   BooleanQuery
 * DefaultSimilarity has been renamed to ClassicSimilarity to
   prepare for the move to BM25 in Lucene 6

New features
 * New Serbian token filter
 * New DecimalDigitFilter, to fold unicode digits to latin digits
 * New UnicodeWhitespaceTokenizer, that uses Unicode's whitespace
   definition and splits on NBSP
 * New GeoPointDistanceRangeQuery to search for geo-points within
   a ring
 * Query caching is now enabled by default in IndexSearcher, use
   IndexSearcher.setQueryCache(null) to disable

Optimizations
 * MatchAllDocsQuery got faster
 * Doc values now use less memory for multi-valued fields and
   less disk in case of sparse fields
 * Two-phase iterators got a match cost API so that the costly
   bits can be checked last

Bug fixes
 * PatternTokenizer no longer hangs onto heap sized to the maximum input
   string it's ever seen.

Please report any feedback to the mailing lists
(http://lucene.apache.org/core/discussion.html)

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 applies to Maven access.

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