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Re:Apache releases Lucene Core 4.0 and Solr 4.0 by donretag on Friday October 12, 2012 @12:20PM (#4645688)
Lucid Imagination has an annotated version of the “Release Highlights” for Lucene/Solr 4.0

http://searchhub.org/dev/2012/10/12/apache-solr-and-lucene-4...

Spellchecking built into the index instead of needing an ancillary one is a big feature, IMHO.

Andrzej Białecki, Robert Muir, and Grant Ingersoll will be presenting a paper on the Lucene 4 architecture: http://opensearchlab.otago.ac.nz/paper_10.pdf

Re:Apache releases Lucene Core 4.0 and Solr 4.0 by snapbug on Saturday October 13, 2012 @01:18AM (#4647979)
Will be? Already have, a couple of months ago.