Elasticsearch has Yellow Status as replicas are Unassigned in RHOCP 4

Issue

• Elasticsearch alert fires continuously

  ElasticsearchClusterNotHealthy - Cluster elasticsearch health status has been YELLOW for at least 20m. Some shard replicas are not allocated.
  

• After switching OSSM to integrate with user-workload monitoring, the Elasticsearch turns YELLOW as replicas for indices are UNASSIGNED.

• Elasticsearch indices are in YELLOW as indices replicas are UNASSIGNED and when reviewed the Elasticsearch allocation policy is observed the message:

  "replica allocations are forbidden due to cluster setting [cluster.routing.allocation.enable=primaries]"}