Current console spam filter plugins are outdated and aren't working with 1.21.3+ so I created this plugin to do the intended work. :)
Note: Some console messages may not get filtered out, in which case I'd say, hey! at least this is better than not having any working plugin for 1.21.3+
Simply drop the jar file in the Plugins folder.
None
Make sure to add the lines you want to filter in the config.yml
Use either of the below commands to reload config file to apply filters without restarting server.
/cf reload
/consolefilter reload