This release has many improvements since release 2.2, including:
- Significantly improved indexing performance
- Segment merging in background threads
- Refreshable IndexReaders
- Faster StandardAnalyzer and improved Token API
- TermVectorMapper to customize how term vectors are loaded
- Live backups (without pausing indexing) with SnapshotDeletionPolicy
- CheckIndex tool to test and recover a corrupt index
- Pluggable MergePolicy and MergeScheduler
- "Partial" optimize(int maxNumSegments) method
- New contrib module for working with Wikipedia content
In addition Lucene 2.3.0 has many performance improvements, bug fixes, etc. See CHANGES.txt for details.
Lucene 2.3.0 includes index format changes that are not readable by older versions of Lucene. Lucene 2.3.0 can both read and update older Lucene indexes. Adding to an index with an older format will cause it to be converted to the newer format.
Binary and source distributions are available here.
Maven artifacts are available here.
Chinese:
Apache Lucene Java 2.3.0 发布了。
Apache Lucene可以说是Java社区全文检索引擎的事实标准，无人不晓，Lucene社区是相当活跃的，几乎每年都有两个版本发布，26号Lucene正式发布2.3版本。
新版本的特性：
l 索引性能的大幅度提高；
l 后台线程的合并；
l 可刷新的索引读写器；
l 标准分析的优化及Toekn API的优化；
l 使用SnapshotDeletionPolicy进行在线备份；
l 使用CheckIndex测试及恢复corrupt index;
l MergePolicy & MergeScheduler;
………..
官方网站：
http://lucene.apache.org/
关于改进的更多信息请查看:
http://svn.apache.org/repos/asf/lucene/java/tags/lucene_2_3_0/CHANGES.txt
具体下载地址：
http://www.apache.org/dyn/closer.cgi/lucene/java/