The Lucene PMC is pleased to announce that the Apache Solr Reference Guide for 6.0 has been released. The Guide has been updated extensively for 6.0, with new sections for Parallel SQL and Cross Data Center Replication.
This 660 page PDF is the definitive guide to Solr and can be downloaded from: https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/apache-solr-ref-guide-6.0.pdf -- Cassandra