The below KBs will fix most Solr issues(Ektron implementation) and anyone installing or maintaining Solr should be aware of them.
KBs for first time and existing installs of Solr
- Critical Steps when Installing or Upgrading Solr
- Solr Search: Which JDK version should I use?
- Antivirus and Solr
- Changes to Oracle's JDK licensing and how it affects Ektron customers using Solr
- Ektron Log4j vulnerability