From the post:
Today Apache Lucene and Solr PMC announced another version of Apache Lucene library and Apache Solr search server numbered 4.5.1. This is a minor bugfix release.
Apache Lucene 4.5.1 library can be downloaded from the following address: http://www.apache.org/dyn/closer.cgi/lucene/java/. Apache Solr 4.5.1 can be downloaded at the following URL address: http://www.apache.org/dyn/closer.cgi/lucene/solr/. Release note for Apache Lucene 4.5.1 can be found at: http://wiki.apache.org/lucene-java/ReleaseNote451, Solr release notes can be found at: http://wiki.apache.org/solr/ReleaseNote451.
Without a “tech surge” no less.