OpenSearch/rest-api-spec/test/get_source/15_default_values.yaml

---
"Default values":
  - do:
      index:
        index: test_1
        type:  test
        id:    1
        body:  { "foo": "bar" }

  - do:
      get_source:
        index: test_1
        type: _all
        id:    1

  - match: { '':  { foo: bar } }