anchor.diff:  
   Ensure that you have the necessary persistent storage for Elasticsearch. Note that each Elasticsearch node
   requires its own storage volume.
  -+
  +
   Elasticsearch is a memory-intensive application. Each Elasticsearch node needs 16G of memory for both memory requests and CPU limits.
   The initial set of {product-title} nodes might not be large enough to support the Elasticsearch cluster. You must add additional nodes to the
   {product-title} cluster to run with the recommended or higher memory. Each Elasticsearch node can operate with a lower
  
positive.code: 
  .. Create a Role-based Access Control (RBAC) object file (for example, `eo-rbac.yaml`) to grant Prometheus permission to access the `openshift-operators-redhat` namespace:
  +
  ----
  apiVersion: rbac.authorization.k8s.io/v1
  kind: Role
  
negative.code: ----
  <1> You must specify the `openshift-operators-redhat` namespace.
  
  .. Run the following command to create the namespace:
  +
  ----
  $ oc create -f <file-name>.yaml
  ----
  +
  For example:
  +
  ----
  $ oc create -f eo-namespace.yaml
  ----
    
  .. Create a Namespace for the Cluster Logging Operator (for example, `clo-namespace.yaml`):
  +
  [source,yaml]
  ----
  apiVersion: v1
  kind: Namespace
  metadata:
    name: openshift-logging
    annotations:
      openshift.io/node-selector: "" <1>
    labels:
      openshift.io/cluster-logging: "true"
      openshift.io/cluster-monitoring: "true"
  ----
  <1> Optionally specify an empty node selector in order for the logging pods to spread
  evenly across your cluster. If you want the logging pods to run on specific nodes, you can specify a node selector value here.
  
  .. Run the following command to create the namespace:
  +
  ----
  $ oc create -f <file-name>.yaml
  ----
  +
  For example:
  +
  ----
  $ oc create -f clo-namespace.yaml
  ----
  
  . Install the Elasticsearch Operator by creating the following objects:
  
  .. Create an Operator Group object YAML file (for example, `eo-og.yaml`) for the Elasticsearch operator:
  +
  