Apache Lucene 6.2.1 发布了，修复了上个版本的3个bug 改进内容：LUCENE-7417:
The standard Highlighter could throw an IllegalArgumentException when
trying to highlight a query containing a degenerate case of a
MultiPhraseQuery with one term. LUCENE-7440:
Document id skipping (PostingsEnum.advance) could throw an
ArrayIndexOutOfBoundsException exception on large index segments
(>1.8B docs) with large skips. LUCENE-7318:
Fix backwards compatibility issues around StandardAnalyzer and its
components, introduced with Lucene 6.2.0. The moved classes were
restored in their original packages: LowercaseFilter and StopFilter, as
well as several utility classes.
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