[ANNOUNCE] Apache Lucene 7.7.0 released

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[ANNOUNCE] Apache Lucene 7.7.0 released

jim ferenczi-2
11 February 2019, Apache Lucene™ 7.7.0 available

The Lucene PMC is pleased to announce the release of Apache Lucene 7.7.0.

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/downloads.html

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


Lucene 7.7.0 Release Highlights:

Bug Fixes
  * Fix LatLonShape WITHIN queries that fail with Multiple search Polygons
that share the dateline.
  * LatLonShape's within and disjoint queries can return false positives
with indexed multi-shapes.

  * ExitableDirectoryReader may now time out queries that run on points
such as range queries or geo queries.
  * StandardTokenizer and UAX29URLEmailTokenizer now support Unicode 9.0,
and provide    Unicode UTS#51 v11.0 Emoji tokenization with the "<EMOJI>"
token type.
  * TopFieldCollector can now early-terminates queries when sorting by
  * Speed up merging segments of points with data dimensions by only
sorting on the indexed dimensions.
  * The KoreanTokenizer no longer splits unknown words on combining
diacritics and detects script boundaries more accurately with
  * Change LatLonShape encoding to use 4 bytes Per Dimension.
  * BufferedUpdates now uses an optimized storage for buffering docvalues
updates that can save up to 80% of the heap used compared to the previous
implementation and uses non-object based datastructures.
  * Moved to the default accepted overhead ratio for packet ints in
DocValuesFieldUpdates yields an up-to 4x performance improvement when
applying doc values updates.
  * Doc-value updates get applied faster by sorting with quicksort, rather
than an in-place mergesort, which needs to perform fewer swaps.
  * Decrease I/O pressure when merging high dimensional points.

Further details of changes are available in the change log available at:

Please report any feedback to the mailing lists (

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