Have you deleted /var/lib/xwiki/data/solr as indicated on https://www.xwiki.org/xwiki/bin/view/ReleaseNotes/Data/XWiki/11.4/#HIssuesspecifictoXWiki11.4 ? If not then it’s most probably the root cause of everything.
Have you deleted /var/lib/xwiki/data/solr as indicated on https://www.xwiki.org/xwiki/bin/view/ReleaseNotes/Data/XWiki/11.4/#HIssuesspecifictoXWiki11.4 ? If not then it’s most probably the root cause of everything.