20.15.

spec:
  exportNetworkFlows:
    netFlow:
      collectors:
        - 192.168.1.99:2056

$ oc patch network.operator cluster --type merge -p "$(cat <file_name>.yaml)"

network.operator.openshift.io/cluster patched

$ oc get network.operator cluster -o jsonpath="{.spec.exportNetworkFlows}"

{"netFlow":{"collectors":["192.168.1.99:2056"]}}

$ for pod in $(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-node -o jsonpath='{range@.items[*]}{.metadata.name}{"\n"}{end}');
  do ;
    echo;
    echo $pod;
    oc -n openshift-ovn-kubernetes exec -c ovnkube-controller $pod \
      -- bash -c 'for type in ipfix sflow netflow ; do ovs-vsctl find $type ; done';
done

ovnkube-node-xrn4p
_uuid               : a4d2aaca-5023-4f3d-9400-7275f92611f9
active_timeout      : 60
add_id_to_interface : false
engine_id           : []
engine_type         : []
external_ids        : {}
targets             : ["192.168.1.99:2056"]

ovnkube-node-z4vq9
_uuid               : 61d02fdb-9228-4993-8ff5-b27f01a29bd6
active_timeout      : 60
add_id_to_interface : false
engine_id           : []
engine_type         : []
external_ids        : {}
targets             : ["192.168.1.99:2056"]-

...

$ oc patch network.operator cluster --type='json' \
    -p='[{"op":"remove", "path":"/spec/exportNetworkFlows"}]'

network.operator.openshift.io/cluster patched