Elasticsearch Operator
The Elasticsearch Operator is responsible for orchestrating and managing cluster logging's Elasticsearch cluster. This operator must be deployed to the global operator group namespace

Memory Considerations
Elasticsearch is a memory intensive application. Red Hat OpenShift Logging will specify that each Elasticsearch node needs 16G of memory for both request and limit unless otherwise defined in the ClusterLogging custom resource. The initial set of OCP nodes may not be large enough to support the Elasticsearch cluster. Additional OCP nodes must be added to the OCP cluster if you desire to run with the recommended(or better) memory. Each ES node can operate with a lower memory setting though this is not recommended for production deployments.