Update example config

[brianrudolf]

Correct a nodePool component to use a dash - instead of an underscore _ as this string is used in a web address and needs to be URL compliant.

Description

This makes a minor change to the component name in an example manifest. Using an underscore causes the operator to fail to create the resource with the following error message:

{
    "level": "error",
    "msg": "Reconciler error",
    "controller": "opensearchcluster",
    "controllerGroup": "opensearch.opster.io",
    "controllerKind": "OpenSearchCluster",
    "OpenSearchCluster": {
        "name": "central-logging-cluster-manager",
        "namespace": "monitoring"
    },
    "namespace": "monitoring",
    "name": "central-logging-cluster-manager",
    "error": "failed to create resource: creating resource failed: Service \"central-logging-opensearch-cluster_manager\" is invalid: metadata.name: Invalid value: \"central-logging-opensearch-cluster_manager\": a DNS-1035 label must consist of lower case alphanumeric characters or '-', start with an alphabetic character, and end with an alphanumeric character (e.g. 'my-name',  or 'abc-123', regex used for validation is '[a-z]([-a-z0-9]*[a-z0-9])?');  failed to create resource: creating resource failed: StatefulSet.apps \"central-logging-cluster-manager-cluster_manager\" is invalid: metadata.name: Invalid value: \"central-logging-cluster-manager-cluster_manager\": a lowercase RFC 1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name',  or '123-abc', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?')"
}

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

Check List

• Commits are signed per the DCO using --signoff
• Unittest added for the new/changed functionality and all unit tests are successful
• Customer-visible features documented
• No linter warnings (make lint)

If CRDs are changed:

• CRD YAMLs updated (make manifests) and also copied into the helm chart
• Changes to CRDs documented

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[swoehrl-mw]

Hi @brianrudolf. Could you please elaborate and give a bit of context where the nodePool component is used in a web address?

[brianrudolf]

@swoehrl-mw apologies I didn't think a draft PR would get attention until I had a chance to add the error message.
The error message I've added to the PR description is from the opensearch-k8s-operator indicating that the nodePool component is used as the name of the underlying Kubernetes Statefulset and must adhere to "a DNS-1035 label".

I made the code change in the web UI, which I now realize isn't signed. Not sure if this is an issue for a docs change.

[swoehrl-mw]

@brianrudolf Thanks for noticing this and filing the PR for it.