fields property
The fields that should be updated.
At least one field must be specified. The root
dropdown_definition_properties is implied and should not be specified. A
single "*" can be used as short-hand for listing every field. When
dropdown_definition_properties.options is included in the field mask,
the full, complete list of desired options must be provided in
dropdown_definition_properties.options.
Implementation
core.String? fields;