Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. It is suitable for nearly any application that requires full-text search, especially cross-platform. License: The Apache License 2.0 Changes: Many new features, optimizations, and bug fixes have been added. Indexing performance was significantly improved. Segment merging is done in background threads. IndexReaders are refreshable. StandardAnalyzer was made faster. Token API and TermVectorMapper were improved to customize how term vectors are loaded. Live backups can be made (without pausing indexing) with SnapshotDeletionPolicy. The CheckIndex tool was added to test and recover a corrupt index. MergePolicy and MergeScheduler are pluggable. A "partial" optimize(int maxNumSegments) method was added. A contrib module was added for working with Wikipedia content.

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