Apache Solr is an open-source search engine that requires Java. However, we do not support Java on our managed environments.
Therefore, to use Apache Solr you must have an unmanaged VPS, Cloud VPS, or unmanaged Dedicated Server. These packages provide you with root access and complete control over the operating environment.
More Information
For more information about Apache Solr, please visit http://lucene.apache.org/solr.