Only Fusion versions 3.0.0 and above are currently supported.

Fusion 1.2 Documentation

Fusion is the platform for intelligent search and search analytics. Fusion leverages Apache Solr, the open source search engine, and Apache Spark, the open source cluster computing framework, to give you fast, scalable, proven, and reliable processing for customized search and analytics over all of your data.

Lucidworks Fusion Platform Diagram