Apache Lucene 6.1.0发布，Java搜索引擎

Apache Lucene 6.1.0 发布了。

一些新特性：

 * Numerous improvements to LatLonPoint, for indexing a latitude/longitude
point and searching by polygon, distance or box, or finding nearest
neighbors
  * Geo3D now has simple APIs for creating common shape queries, matching
LatLonPoint

Optimizations
  * Faster indexing and searching of points.
  * Faster geo-spatial indexing and searching for LatLonPoint, Geo3D and
GeoPoint (see http://home.apache.org/~mikemccand/geobench.html )
  * HardlinkCopyDirectoryWrapper optimizes file copies using hard links
  * In case of contention, the query cache now prefers returning an
uncached Scorer rather than waiting on a lock.

Bug fixes
  * BooleanQuery could sometimes assign too low scores to ranges of
documents that matched a single clause.
  * Doc values updates could sometimes be applied in the wrong order.

API 改进：

1. LUCENE-7163: refactor GeoRect, Polygon, and GeoUtils tests to geo package in core
   (Nick Knize)

2. LUCENE-7152: Refactor GeoUtils from lucene-spatial package to core
   (Nick Knize)

3. LUCENE-7141: Switch OfflineSorter's ByteSequencesReader to BytesRefIterator
   (Mike McCandless)

4. LUCENE-7150: Spatial3d gets useful APIs to create common shape queries, matching LatLonPoint.
   (Karl Wright via Mike McCandless)

5. LUCENE-7243: Removed the LeafReaderContext parameter from QueryCachingPolicy#shouldCache.
   (Adrien Grand)

6. LUCENE-7283: SlowCompositeReaderWrapper and the uninverting package have been moved to Solr.
   (Mike McCandless)

Lucene 是apache软件基金会一个开放源代码的全文检索引擎工具包，是一个全文检索引擎的架构，提供了完整的查询引擎和索引引擎，部分文本分析引擎。 Lucene的目的是为软件开发人员提供一个简单易用的工具包，以方便的在目标系统中实现全文检索的功能，或者是以此为基础建立起完整的全文检索引擎。

Lucene 最初是由Doug Cutting所撰写的，是一位资深全文索引/检索专家，曾经是V-Twin搜索引擎的主要开发者，后来在Excite担任高级系统架构设计师，目前从事 于一些INTERNET底层架构的研究。他贡献出Lucene的目标是为各种中小型应用程式加入全文检索功能。

OSChina 使用 Lucene 实现全文搜索。