DSE Search cannot find custom files (DataStax Enterprise 5.0) 

DSE Search does not support relative paths set by the <lib> property.

The DataStax Enterprise Help Center also provides troubleshooting information.

Apache Solr™ supports relative paths that are set by the lib property in the solrconfig.xml, but DSE Search does not. Configuring the Solr library path describes a workaround for this issue.