Adinternal/cron is unauthorized for user _system

Thanks @vemsarat for your reply.
If i actually try to use the ad plugin i get Elasticsearch security config - #4 by bpavani as well. So is there a way around to somehow “only use” the security plugin for opendistro plugins and xpack for the other elasticsearch components? As i understand
https://github.com/opendistro-for-elasticsearch/security/issues/37 is an issue regarding this and #issuecomment-747491504 says that its on the way. Is there a time plan? Is there a current somehow “hacky” solution?

If there is no option to get ad plugin with xpack woring on the same cluster, can one setup a second opendistro cluster besides a normal elastiseach cluster and use the ad plugin on the opendistro cluster and let the opendistro and elasticsearch cluster exchange data. So are opendistro and elasticsearch cluster fully integrated with each other?