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 Flex Dedicated Server. These packages provide you with root access and complete control over the operating environment.
For more information about Apache Solr, please visit http://lucene.apache.org/solr.