Apache Lucene 4.7.0 发布，此版本包括了大量的 bug 修复，系统优化和改进，现已提供下载。
值得关注的更新内容如下：
* When sorting by String (SortField.STRING), you can now specify whether
missing values should be sorted first (the default), or last.
* Add two memory resident dictionaries (FST terms dictionary and FSTOrd
terms dictionary) to improve primary key lookups. The
PostingsBaseFormat API is also changed so that term dictionaries get
the ability to block encode term metadata, and all dictionary
implementations can now plug in any PostingsBaseFormat. See
http://blog.mikemccandless.com/2013/09/lucene-now-has-in-memory-terms.html
* NRT support for file systems that do not have delete on last close or
cannot delete while referenced semantics.
* Add LongBitSet for managing more than 2.1B bits (otherwise use
FixedBitSet).
* Speed up Lucene range faceting from O(N) per hit to O(log(N)) per hit
using segment trees. See
http://blog.mikemccandless.com/2013/12/fast-range-faceting-using-segment-trees.html
* Add SearcherTaxonomyManager over search and taxonomy index directories
(i.e. not only NRT).
* Drilling down or sideways on a Lucene facet range (using
Range.getFilter()) is now faster for costly filters (uses random
access, not iteration); range facet counts now accept a fast-match
filter to avoid computing the value for documents that are out of
bounds, e.g. using a bounding box filter with distance range faceting.
* Add Analyzer for Kurdish.
* Add Payload support to FileDictionary (Suggest) and make it more
configurable.
* Add a new BlendedInfixSuggester, which is like AnalyzingInfixSuggester
but boosts suggestions that matched tokens with lower positions.
* Add SimpleQueryParser: parser for human-entered queries.
* Add multitermquery (wildcards,prefix,etc) to PostingsHighlighter.
* Upgrade to Spatial4j 0.4.1: Parses WKT (including ENVELOPE) with
extension "BUFFER"; buffering a point results in a Circle. JTS isn't
needed for WKT any more but remains required for Polygons. New Shapes:
ShapeCollection and BufferedLineString. More info:
https://github.com/spatial4j/spatial4j/blob/master/CHANGES.md
* Add spatial SerializedDVStrategy that serializes a binary
representation of a shape into BinaryDocValues. It supports exact
geometry relationship calculations.
* Various bugfixes and optimizations since the 4.6.1 release.
下载地址：http://lucene.apache.org/core/mirrors-core-latest-redir.html
来自:开源中国社区
