Cluster name is logged as ${sys:es.logs.cluster_name}

Elastic Stack Elasticsearch
1

Hello

we are upgrading our Elastic clusters to 9.2.5.
I upgraded my monitoring cluster from 8.19.4 to 8.19.11, since this upgrade the cluster_name in the elasticsearch server logs is logged as ${sys:es.logs.cluster_name}
I then upgraded the monitoring cluster to 9.2.5 but the problem still remains, cluster name is logged as ${sys:es.logs.cluster_name}

How can I solve this issue?

Best regards
Christophe

2

Fyi, I have seen the same issue on multiple clusters after update to 9.2.4 or higher.