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From jim ferenczi <jim...@apache.org>
Subject [ANNOUNCE] Apache Lucene 6.4.0 released
Date Mon, 23 Jan 2017 09:08:15 GMT
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23 January 2017, Apache Luceneā„¢ 6.4.0 available

The Lucene PMC is pleased to announce the release of Apache Lucene 6.4.0.

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

Lucene 6.4.0 Release Highlights:

New features
  * Lucene's best efforts to un-map memory mapped files with
"MMapDirectory" now work with the latest Java9 early access builds
  * A new similarity "BooleanSimilarity" that gives terms a score that
is equal to their query boost
  * The axiomatic family of similarities (6 in total) based on
https://www.eecis.udel.edu/~hfang/pubs/sigir05-axiom.pdf
  * A new token filter "SynonymGraphFilter" that outputs a correct
graph structure for multi-token synonyms at query time
  * Graph token streams, such as those produced by the
"SynonymGraphFilter", are now handled accurately by query parsers
  * A new collector "DocValuesStatsCollector" gives the ability to
compute statistics on DocValues field
  * It is now possible to filter "SortedDocValues" and
"SortedSetDocValues" terms enum with a compiled automaton
  * The "UnifiedHighlighter" can now highlight fields with queries
that don't necessarily refer to that field
  * DrillSideways can now run queries concurrently
  * Index sorting now supports sorting on multi-valued fields using
MIN, MAX, etc. selectors

Optimizations
  * Points do not store the implicit split dimension in the
1-dimension case. This saves between 6% memory for the largest types
such an InetAddressPoint to 33% for the smaller types such as
HalfFloatPoint.
  * The BKD in-memory index for dimensional points now uses a
compressed format, using substantially less RAM in some cases
  * The BKD writing now buffers each leaf block in heap before writing
to disk, giving a small speedup in points-heavy use cases
  * "TermAutomatonQuery" now rewrites to more efficient queries when possible

Along with numerous bug fixes.

Further details of changes are available in the change log available
at: http://lucene.apache.org/core/6_4_0/changes/Changes.html

Please note, this release cannot be built from source with Java 8
update 121, use an earlier version instead! This is caused by a bug
introduced into the Javadocs tool shipped with that update. The
workaround was too late for this Lucene release. Of course, you can
use the binary artifacts.

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.

Thanks,
Jim Ferenczi
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