Support formatting of the document_id_field in the OpenSearch sink

[graytaylor0]

Is your feature request related to a problem? Please describe.

In the index parameter of the OpenSearch sink this format is supported to format from multiple keys or expression results in the Event

index: "${key-one}-${key-two}-${getMetadata(\"some_metadata_key\")"

but document_id_field has never supported the format option, so it has to either be

document_id_field: "some_key"

or

document_id_field: "getMetadata(\"some_metadata_key\")"

Describe the solution you'd like
To allow the same formatting as index for document_id_field, but without breaking the existing one (if a temporary document_id_field_format option is needed until it is possible to make a breaking change, then that works as well. It may be possible to do now without breaking the existing functionality though

document_id_field: "${key-one}-${key-two}-${getMetadata(\"some_metadata_key\")}"

Describe alternatives you've considered (Optional)
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.