FHIR - datamapper: UPDATE action - missing resource id field

(Migrated from https://github.com/syndesisio/syndesis/issues/5558)

Author: Martin Stepanek
Assignees: Rafal Korytkowski,

This is a...

[pre][code]
[ ] Feature request
[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report [!-- Please search GitHub for a similar issue or PR before submitting --]
[ ] Documentation issue or request
[/code][/pre]

Description

Let's have an integration
... -> FHIR Create -> datamapper -> FHIR - Update -> ...

I want to update the resorce I've just created. How can I tell what resource I want to update?
Analogically, if I want to Read a resource I can map a resource id via datamapper from the previous steps. But I can't do the same using Update action because there is not resource id field.
!FHIR_read_resourceId
!FHIR_update_resourceId