Solr 3.1 released

Version 3.1 of Apache Solr has been released.

Solr 3.1 is based on Lucene 3.1 .

The index structure is different from that in version 1.4

DataImportHandler jars are no longer included in the Solr WAR file.

Solr 3.1 includes support for Spatial search

You can now send updates to the index in JSON format via JsonUpdateRequestHandler

In addition the default XML formatted results and JSON Response Writer for responses in JSON format, there's the CSVResponseWriter for getting results in CSV format.

The Solr UIMA contrib library enables analysis of unstructured data.

Read more about this release at http://lucene.apache.org/solr/#March+2011+-+Solr+3.1+Released