Apache Lucene is the highest performing, full-featured text search engine library that has been completely written entirely in Java. It is currently in use by many large organizations since it is a technology that has been developed suitable for nearly any application that requires full-text search, especially across platforms. Apache Lucene is an open source project available for free download from their websites.
Lucene plans for events where a particular patch is released with many new features. The last release, in September 2009, had many improvements like per segment searching and caching, near real-time search capabilities added to IndexWriter, new query types and smarter and more scalable multi-term queries (wildcard, range, etc).
The other new features that were included consist of: a freshly optimized collector/scorer API, improved unicode support, a new attribute based TokenStream API, and a new QueryParser framework in contribution with a core QueryParser replacement included.
There were new analyzers like PersianAnalyzer, ArabicAnalyzer and SmartChineseAnalyzer introduced during the last release in September. A new fast-vector-highlighter for large documents was also included in the release.
The new Lucene version included high-performance handling of numeric fields. The fields are indexed with a tree structure, making simple to use and faster numeric range searching without having to externally pre-process numeric values into textual values.
Similar to the event in September, a new event is planned for November 2009. Events such as two full days of talks, plus a meet up and the usual bevy of training that is usually conducted by the teams across many cities in the US is planned this time too.
Lucene and Solr are spearheading the technology developments in enterprise search, whose economical benefits can be enjoyed by clients. Lucene searches can also be used in discussion groups, commercial issue trackers and in email searches. Diverse Fortune 100 companies including Microsoft, Akamai, Overture, Technorati, HotJobs, Epiphany, FedEx, Mayo Clinic, MIT, New Scientist Magazine, and many others use Lucene technology.
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