Deployment of logging fails if openshift_logging_es_nodeselector variable is not specified in OCP 3.11

Issue

• Deployment of logging fails if openshift_logging_es_nodeselector variable is not specified in the inventory file

TASK [assert] *******************************************************************************************************************************************************************************************************************************
fatal: [master.example.com]: FAILED! => {
    "assertion": "openshift_logging_es_ops_nodeselector is defined",
    "changed": false,
    "evaluated_to": false,
    "msg": "A node selector is required for Elasticsearch Ops pods, please specify one with openshift_logging_es_ops_nodeselector"
}