org.janusgraph.diskstorage.es.ElasticSearchIndex.checkClusterHealth

org.janusgraph.diskstorage.es.ElasticSearchIndex.checkClusterHealth(ElasticSearchIndex.java:412)
URI [/_cluster/health?timeout=30s&wait_for_status=yellow], status line [HTTP/1.1 401 Unauthorized]
{"error":{"root_cause":[{"type":"security_exception","reason":"unable to authenticate user [cognizer] for REST request [/_cluster/health?timeout=30s&wait_for_status=yellow]","header":{"WWW-Authenticate":["Basic realm="security" charset="UTF-8"","ApiKey"]}}],"type":"security_exception","reason":"unable to authenticate user [cognizer] for REST request [/_cluster/health?timeout=30s&wait_for_status=yellow]"

I upgraded ES to 8.1.0 Now, I'm not able to start JG

That does seem to be a question for the JanusGraph community.

there were issue with es credentials I had change the cred now issue has fix