Per Document monitor alert that includes Document findings

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
OpenSearch 2.11.1
OpenSearch Dashboards 2.11.1

Describe the issue:
I have defined a per_document monitor that queries for a specific document id. I want to include fields from the triggering documents in the alert message body. I copied the example Mustache code from

and

substituting the field name from my records into the message body.

Unfortunately, when the alert arrives at the destination (I am using email for my testing), these parts of the alert body are empty.

Can you tell me what parts of ctx I can access to pull the document fields into my alerts?

Configuration:

Relevant Logs or Screenshots:

Could you show the definition of your per document monitor and show the document findings?

I found that the feature I am looking for isn’t available until Opensearch 2.13. Hopefully it is not too painful to upgrade.