[Logging 5.6.0]CLF raises 'invalid: unrecognized outputs: [default]' after adding `default` to outputRefs.

    conditions:
    - lastTransitionTime: "2023-01-06T05:46:22Z"
      message: 'degraded pipelines: invalid [], degraded [forward-to-external-es]'
      reason: Invalid
      status: "True"
      type: Degraded
    - lastTransitionTime: "2023-01-06T05:46:22Z"
      message: Some pipelines are degraded or invalid
      reason: Invalid
      status: "True"
      type: Ready

    pipelines:
      forward-to-external-es:
      - lastTransitionTime: "2023-01-06T05:46:22Z"
        message: 'invalid: unrecognized outputs: [default]'
        reason: Invalid
        status: "True"
        type: Degraded

E0106 05:45:57.984521       1 event.go:337] Unsupported event type: 'Error'
E0106 05:46:10.168678       1 event.go:337] Unsupported event type: 'Error'
{"_ts":"2023-01-06T05:46:10.174033658Z","_level":"0","_component":"cluster-logging-operator","_message":"clusterlogforwarder-controller error updating status","_error":{"msg":"Operation cannot be fulfilled on clusterlogforwarders.logging.openshift.io \"instance\": the object has been modified; please apply your changes to the latest version and try again"}}
E0106 05:46:22.357475       1 event.go:337] Unsupported event type: 'Error'
E0106 05:46:34.532686       1 event.go:337] Unsupported event type: 'Error'
{"_ts":"2023-01-06T05:46:34.53823159Z","_level":"0","_component":"cluster-logging-operator","_message":"clusterlogforwarder-controller error updating status","_error":{"msg":"Operation cannot be fulfilled on clusterlogforwarders.logging.openshift.io \"instance\": the object has been modified; please apply your changes to the latest version and try again"}}
E0106 05:46:46.695647       1 event.go:337] Unsupported event type: 'Error'
E0106 05:46:58.898357       1 event.go:337] Unsupported event type: 'Error'
E0106 05:47:11.087465       1 event.go:337] Unsupported event type: 'Error'
E0106 05:47:23.269888       1 event.go:337] Unsupported event type: 'Error' 

apiVersion: logging.openshift.io/v1
kind: ClusterLogging
metadata:
  name: instance
  namespace: openshift-logging
spec:
  collection:
    type: vector
  logStore:
    elasticsearch:
      nodeCount: 1
      redundancyPolicy: ZeroRedundancy
      resources:
        requests:
          memory: 2Gi
      storage: {}
    retentionPolicy:
      application:
        maxAge: 3h
      audit:
        maxAge: 3h
      infra:
        maxAge: 3h
    type: elasticsearch
  managementState: Managed
  visualization:
    kibana:
      replicas: 1
    type: kibana 

apiVersion: logging.openshift.io/v1
kind: ClusterLogForwarder
metadata:
  name: instance
  namespace: openshift-logging
spec:
  outputs:
  - name: es-created-by-user
    type: elasticsearch
    url: http://elasticsearch-server.e2e-test-vector-es-namespace-6bpck.svc:9200
  pipelines:
  - inputRefs:
    - infrastructure
    - application
    - audit
    name: forward-to-external-es
    outputRefs:
    - es-created-by-user 

    pipelines:
    - inputRefs:
      - infrastructure
      - application
      - audit
      name: forward-to-external-es
      outputRefs:
      - es-created-by-user
      - default