Apache Lucene 4.5.0 發布，Java全文搜索引擎
Apache Lucene是一個高性能，全功能的全文搜索引擎庫，完全用Java編寫。它適用于幾乎需要全文搜索功能的任何應用程序，尤其是跨平臺的。
Lucene通過一個簡單的API，提供了強大的功能：
Scalable, High-Performance Indexing
- over 150GB/hour on modern hardware
- small RAM requirements -- only 1MB heap
- incremental indexing as fast as batch indexing
- index size roughly 20-30% the size of text indexed </ul>
- ranked searching -- best results returned first
- many powerful query types: phrase queries, wildcard queries, proximity queries, range queries and more
- fielded searching (e.g. title, author, contents)
- sorting by any field
- multiple-index searching with merged results
- allows simultaneous update and searching
- flexible faceting, highlighting, joins and result grouping
- fast, memory-efficient and typo-tolerant suggesters
- pluggable ranking models, including the Vector Space Model and Okapi BM25
- configurable storage engine (codecs) </ul>
- Available as Open Source software under the Apache License which lets you use Lucene in both commercial and Open Source programs
- 100%-pure Java
- Implementations in other programming languages available that are index-compatible </ul>
Powerful, Accurate and Efficient Search Algorithms
Cross-Platform Solution
版本說明：基于磁盤的DOC值和改進的過濾器緩存。
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