bug: GROK parser doesn't work in fluentd.fluent.io_clusterfluentdconfigs

[kardanielyan]

Describe the issue

I have an issue with the GROK parser.
I created Fluentd/ClusterFilter.
I specified the GROK pattern but am receiving the following error:

2023-11-06 11:14:09 +0000 [error]: config error file="/fluentd/etc/fluent.conf" error_class=Fluent::ConfigError error="no grok patterns. Check configuration, e.g. typo, configuration syntax, etc" level=error msg="Fluentd exited" error="exit status 1"

To Reproduce

This is a simplified version of my ClusterFilteryaml.

apiVersion: fluentd.fluent.io/v1alpha1
kind: ClusterFilter
metadata:
    filter.fluentd.fluent.io/enabled: 'true'
  name: fluentd-filter
spec:
  filters:
    - parser:
        keyName: message
        parse:
          grok:
            - name: test_logs
              pattern: "%{HOST:host} %{IPORHOST:client_ip}"
          type: grok
        reserveData: true
    - recordTransformer:
        enableRuby: true
        records:
          - key: environment
            value: stg

After applying the pattern field disappears.

Expected behavior

Parse logs based on GROK patterns.

Your Environment

- Fluent Operator version: v2.5.0
- Container Runtime: containerd
- Operating system: [GKE, Container-Optimized OS] (https://cloud.google.com/kubernetes-engine/docs/concepts/node-images#cos)
- Kernel version: 5.15.109+

How did you install fluent operator?

I deployed fluent-operator via the official HELM chart.
https://github.com/fluent/fluent-operator/releases/tag/v2.5.0

Additional context

No response