Mutation operators do not work with version variables in code blocks and links

[colleenmcginnis]

Describe the bug

Mutation operators do not work with version variables in code blocks.

Expected behavior

I'd expect {{version.stack | M.M}} to be replaced with 9.0 in code blocks with subs=true.

Steps to reproduce

Here's what I tried:

To get the manifests just run:

{{version.stack | M.M}}

```sh subs=true
curl -L -O https://raw.github.com/elastic/beats/{{version.stack | M.M}}/deploy/kubernetes/auditbeat-kubernetes.yaml
```

Rendered result:

Tooling

• docs-builder
• migration tooling
• I'm not sure

[colleenmcginnis]

There might be a similar problem with links:

Example 1

Syntax
With spaces ({{ version.eck | M.M }}).

You can find [a complete example in the ECK GitHub repository](https://github.com/elastic/cloud-on-k8s/blob/{{ version.eck | M.M }}/config/recipes/autoscaling/elasticsearch.yaml) which will also show you how to fine-tune the [autoscaling deciders](/deploy-manage/autoscaling/autoscaling-deciders.md).

Result
The version is substituted, but the link is not rendered as a link.

Example 2

Syntax
Without spaces ({{version.eck|M.M}}).

You can find [a complete example in the ECK GitHub repository](https://github.com/elastic/cloud-on-k8s/blob/{{version.eck|M.M}}/config/recipes/autoscaling/elasticsearch.yaml) which will also show you how to fine-tune the [autoscaling deciders](/deploy-manage/autoscaling/autoscaling-deciders.md).

Result
The link is rendered as a link, but the variable is not substituted (https://github.com/elastic/cloud-on-k8s/blob/%7B%7Bversion.eck%7CM.M%7D%7D/config/recipes/autoscaling/elasticsearch.yaml).