After successfully creating an Item - and polling until its status changes to RUNNING - you can submit update requests.
Update an Item by sending an HTTP POST or PUT request, with a JSON object in the request body.
The JSON object need not contain a full field set - you can choose to include only those fields that need updating. Fields that are omitted (or null) will remain unchanged.
The response includes the Item object with the updated fields.
When updating a resource, you can use either PUT or POST.
You can choose to include only those fields that need updating. Fields that are omitted ornull, will remain unchanged.