Apache Lucene 4.4 发布了，包含很多 bug 修复、优化和提升，下载地址：
http://lucene.apache.org/core/mirrors-core-latest-redir.html
值得关注的改进有：
* 全新的 Replicator 模块，实现复制索引修订版的功能
* 新的 AnalyzingInfixSuggester
* 新的 PatternCaptureGroupTokenFilter: emit multiple tokens, one for each capture group in one or more Java regexes.
* 新的 Lucene Facet 模块特性：
* Added dynamic (no taxonomy index used) numeric range faceting (see
http://blog.mikemccandless.com/2013/05/dynamic-faceting-with-lucene.html )
* Arbitrary Querys are now allowed for per-dimension drill-down on
DrillDownQuery and DrillSideways, to support future dynamic faceting.
* New FacetResult.mergeHierarchies: merge multiple FacetResult of the
same dimension into a single one with the reconstructed hierarchy.
* FST's Builder can now handle more than 2.1 billion "tail nodes" while building a minimal FST.
* FieldCache Ints and Longs now use bit-packing to save memory. String fields have more efficient compression if there are many unique terms.
* Improved compression for NumericDocValues for dates and fields with very small numbers of unique values.
* New IndexWriter.hasUncommittedChanges(): returns true if there are changes that have not been committed.
* multiValuedSeparator in PostingsHighlighter is now configurable, for cases where you want a different logical separator between field values.
* NorwegianLightStemFilter and NorwegianMinimalStemFilter have been extended to handle "nynorsk".
* New ScandinavianFoldingFilter and ScandinavianNormalizationFilter.
* Easier compressed norms: Lucene42NormsFormat now takes an overhead parameter, allowing for values other than PackedInts.FASTEST.
* Analyzer now has an additional tokenStream(String fieldName, String text) method, so wrapping by StringReader for common use is no longer needed.
* New SimpleMergedSegmentWarmer: just ensures that data structures (terms, norms, docvalues, etc.) are initialized.
* IndexWriter flushes segments to the compound file format by default.
* Various bugfixes and optimizations since the 4.3.1 release.
完整列表请看下载压缩包中的 CHANGES.txt
来自:开源中国社区
