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From ntangleWildlife <>
Subject [Announce] Apache Solr 4.6 with RankingAlgorithm 1.5.2 available now with complex-lsa algorithm (simulates human language acquisition and recognition)
Date Sun, 15 Dec 2013 16:33:32 GMT

I am very excited to announce the availability of Solr 4.6 with 
RankingAlgorithm 1.5.2.

Solr 4.6 with RankingAlgorithm 1.5.2 includes the new algorithm 
complex-lsa. complex-lsa simulates human language acquisition and 
recognition (see demo <>) 
and can retrieve semantically related/hidden relationships between 
terms, sentences, paragraphs, chapters, books, images, etc. Three new 
TERM_DOCUMENT_SIMILARITY enable these with improved precision.

Solr 4.6 with RankingAlgorithm 1.5.2 also includes realtime-search with 
multiple granularities. realtime-search is very fast NRT and allows you 
to not only lookup a document by id but also allows you to search in 
realtime, see The update performance 
is about 70,000 docs / sec. The query performance is in ms, allows you 
to  query a 10m wikipedia index (complete index) in <50 ms.

RankingAlgorithm 1.5.2 with complex-lsa supports the entire Lucene Query 
Syntax, ± and/or boolean/dismax/glob/regular 
expression/wildcard/fuzzy/prefix/suffix queries with boosting, etc. and 
is compatible with the new Lucene 4.6 api.

You can get more information about complex-lsa and realtime-search 
performance from here:

You can download Solr 4.6 with RankingAlgorithm 1.5.2 from here:

Please download and give the new version a try.


Nagendra Nagarajayya

1. Apache Solr 4.6 with RankingAlgorithm 1.5.2 is an external project.
2. realtime-search has been contributed back to Apache Solr, see

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