Amazon OpenSearch Master Nodes JVM Memory pressure consistently increasing

My Opensearch cluster Master Nodes JVM Memory pressure was constantly stable for a long time. A few days ago, it started to consistently increase.

I want to understand why this is happening, and what might be the root cause for this increase? We have no changes in the cluster configuration.

Solution

After talking with AWS support, It turned out to be a regular behavior that happen when Master Node is changed, i.e., a new master node is elected.