If you are not familiar with the oc command, refer to OpenShift - Getting Started with the oc command.

By default, the Elastic Search Management State should be Managed.

~]$ oc get elasticsearch --namespace openshift-logging 
NAME            MANAGEMENT STATE   HEALTH   NODES   DATA NODES   SHARD ALLOCATION   INDEX MANAGEMENT 
elasticsearch   Managed            green    3       3            all 

Which can also be seen in the Elastic Search YAML.

~]$ oc get elasticsearch --namespace openshift-logging --output yaml
apiVersion: v1
items:
- apiVersion: logging.openshift.io/v1
  kind: Elasticsearch
  spec:
    managementState: Managed

The oc patch command can be used to update the Management State to Unmanaged.

~]$ oc patch elasticsearch elasticsearch --namespace openshift-logging --type merge --patch '{"spec":{"managementState":"Unmanaged"}}'
elasticsearch.logging.openshift.io/elasticsearch patched

Now, the Elastic Search Management State should be Unmanaged.

~]$ oc get elasticsearch --namespace openshift-logging 
NAME            MANAGEMENT STATE   HEALTH   NODES   DATA NODES   SHARD ALLOCATION   INDEX MANAGEMENT 
elasticsearch   Unmanaged          green    3       3            all 

Which can also be seen in the Elastic Search YAML.

~]$ oc get elasticsearch --namespace openshift-logging --output yaml
apiVersion: v1
items:
- apiVersion: logging.openshift.io/v1
  kind: Elasticsearch
  spec:
    managementState: Unmanaged