JSON logs are not parsed for the external Elasticsearch in RHOCP 4

Issue

• Application logs with a JSON structure are not sent.
• After adding parse: json field in the ClusterLogForwarder (CLF) instance, the JSON logs are not sent.

• After creating a ClusterLogForwarder (CLF) instance with the external Elasticsearch output and JSON enabled, the message below appears in the instance:

  $ oc get clf instance -o yaml
  [...]
  status:
  conditions:
  - lastTransitionTime: "2023-04-03T08:41:15Z"
  message: 'validation failed: structuredTypeKey or structuredTypeName must be defined
    for Elasticsearch output named "elasticsearch-test" when JSON parsing is enabled
    on pipeline "my-app" that references it'
  reason: Invalid
  status: "False"
  type: Ready
  [...]