resourceKey property
Input only.
Immutable. Resource key (^[a-zA-Z0-9_-]{1,128}$) required to access
certain older link-shared Google Drive files returned by the Google Drive
Picker (for shortcuts, pass the resolved target file's resource key).
Never persisted in database records or returned in Document resources (see
companion field resource_key_set, AIP-147).
Optional.
Implementation
core.String? resourceKey;