OpenSearch/rest-api-spec/test/update/80_fields.yaml

---
"Fields":

  - do:
      update:
          index:  test_1
          type:   test
          id:     1
          fields: foo,bar,_source
          body:
            doc:    { foo: baz }
            upsert: { foo: bar }

  - match:   { get._source.foo: bar }
  - match:   { get.fields.foo:  bar }
  - is_false:  get.fields.bar

# TODO:
#
# - Add _routing