google.protobuf.field_mask_pb2.FieldMask
Required. The list of fields to update. A field is
overwritten if, and only if, it is in the mask. Any
immutable fields set in the mask are ignored by the server.
Repeated fields and map fields are only allowed in the last
position of a paths string and overwrite the existing
values. Hence an update to a repeated field or a map should
contain the entire list of values. The fields specified in
the update_mask are relative to the resource and not to the
request. (e.g. MaxRequestDuration; *not*
entitlement.MaxRequestDuration) A value of '*' for this
field refers to full replacement of the resource.
