Solr/Lucene 5 is a major release with lots of features and bug fixes. It is backward compatible with Solr4.x, but if you wish to upgrade from 3.x or older, you need to first upgrade to 4.x if you want to avoid reindexing all content.
The main news for Solr in 5.x is start scripts and installer script for Linux. You can now also throttle bandwidth of index replication. 5.1 brings an API to change common solrconfig.xml parameters during runtime. There is also a new JSON API for faceting and querying. See CHANGES.TXT for details.
New Solr versions are released quite frequently. Since we wrote about 4.7 back in March, we got Solr 4.8 on April 28th, 4.8.1 May 20th, 4.9.0 June 25th, 4.10.0 September 3rd, 4.10.1 September 29th, and 4.10.2 on October 31st.
Here are my favorite highlights:
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