Solr is an popular, fast, and open source enterprise search platform built on Apache Lucene™. You have to setup a SOLR server if you want to use the WissKI Solr search. In addition to the system-wide installation, it is also possible to containerize Solr.
If you are using the Lubuntu WissKI-VM a Solr Server with a gettingstarted dummy core is already set up!