FeedItemOperation

A single operation (create, update, remove) on an feed item.

Fields
update_mask	FieldMask FieldMask that determines which resource fields are modified in an update.
Union field operation operation. The mutate operation. operation can be only one of the following:
create	FeedItem Create operation: No resource name is expected for the new feed item.
update	FeedItem Update operation: The feed item is expected to have a valid resource name.
remove	string Remove operation: A resource name for the removed feed item is expected, in this format: customers/{customer_id}/feedItems/{feed_id}~{feed_item_id}