updateMask property
Only applies to
[settings.datasources.patch](https://developers.google.com/cloud-search/docs/reference/rest/v1/settings.datasources/patch).
Update mask to control which fields to update. Example field paths:
name, displayName. * If update_mask is non-empty, then only the
fields specified in the update_mask are updated. * If you specify a
field in the update_mask, but don't specify its value in the source,
that field is cleared. * If the update_mask is not present or empty or
has the value *, then all fields are updated.
Implementation
core.String? updateMask;