Revert "Allow single fields in fields and _source parameters" #2341
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Reverts #2317. The
FieldAndFormat
type has a@shortcut_property
field which means that if it's a scalar value, it is equivalent to aFieldAndFormat
with only field defined. The code generation strategy for Python should be to lift the shortcut property into a union, so thatFieldAndFormat
becomesField | FieldAndFormat
.