Title: Lucene Core 4.9.0 Available category: core/news URL: save_as:

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: https://lucene.apache.org/core/mirrors-core-latest-redir.html

See the CHANGES.txt file included with the release for a full list of details.

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 Accountable interface.

• 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.