Apache Lucene 4.6.0 发布了，主要改进包括：
* Added support for NumericDocValues field updates (without
re-indexing the document) through
IndexWriter.updateNumericDocValue(Term, String, Long).
* New FreeTextSuggester can predict the next word using a simple ngram
language model useful for "long tail" suggestions.
* A new expression module allows for customized ranking with script-like syntax.
* A new DirectDocValuesFormat can hold all doc values in heap as
uncompressed java native arrays.
* Term.hasFreqs can now determine if a given field indexed per-doc
term frequencies.
* Various bugfixes and optimizations since the 4.5.1 release.
详细列表请看下载中的 CHANGES.txt 文件。
项目主页：http://lucene.apache.org/
下载地址：http://www.apache.org/dyn/closer.cgi/lucene/java/
来自:开源中国社区
