24 June 2014, Apache Lucene™ 4.9.0 available
The Lucene PMC is pleased to announce the release of Apache Lucene 4.9.0
Apache Lucene is a high-performance, full-featured text search engine
library written entirely in Java. It is a technology suitable for nearly
any application that requires full-text search, especially cross-platform.
This release contains numerous bug fixes, optimizations, and
improvements, some of which are highlighted below. The release
is available for immediate download at:
See the CHANGES.txt file included with the release for a full list of
Lucene 4.9.0 Release Highlights:
* New Terms.getMin/Max methods to retrieve the lowest and highest
terms per field.
* New IDVersionPostingsFormat, optimized for ID lookups that associate
a monotonically increasing version per ID.
* Atomic update of a set of doc values fields.
* Numerous optimizations for doc values search-time performance.
* New (default) Lucene49NormsFormat to better compress certain cases
such as very short fields.
* New SORTED_NUMERIC docvalues type for efficient processing of
multi-valued numeric fields.
* Indexer passes previous token stream for easier reuse.
* MoreLikeThis accepts multiple values per field.
* All classes that estimate their RAM usage now implement a new
* Lucene files are now written by (File)OutputStream on all platforms,
completely disallowing seeking with simplified IO APIs.
* Improve the confusing error message when MMapDirectory cannot create
a new map.
Please read CHANGES.txt for a full list of new features.
Please report any feedback to the mailing lists
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