Disallow calling a `mapper` by name in `meltano run` and alert to use a `mapping` name

The document misses a step for mapper configuration. Property mapping_name has to be added to the mappers extras, and its value need to match with the name under mappings. It doesn’t seem been documented anywhere.

plugins:
  mappers:
  - name: transform-field
    variant: transferwise
    pip_url: pipelinewise-transform-field
    executable: transform-field
    mapping_name: transform-field-hash
    mappings:
    - name: transform-field-hash
      config:
        transformations:
          - field_id: Name
            tap_stream_name: dbo-Test
            type: MASK-HIDDEN

[aaronsteers]

• Hard fail if a mapper is called
• Point users to call a specific mapping

👍 I like it!

[tayloramurphy]

@edgarrmondragon I think that makes sense. I’ll update the title of this issue and scope it to the following:

• Hard fail if a mapper is called
• Point users to call a specific mapping

Looking at the docs it’s not clear how we could update it to be more descriptive, but I think we can be explict in the code