Deletes a FHIR resource that match an identifier search query. Implements the FHIR standard conditional delete interaction, limited to searching by resource identifier. If multiple resources match, 412 Precondition Failed error will be returned. Search term for identifier should be in the pattern identifier=system|value or identifier=value - similar to the search method on resources with a specific identifier. Note: Unless resource versioning is disabled by setting the disable_resource_versioning flag on the FHIR store, the deleted resource is moved to a history repository that can still be retrieved through vread and related methods, unless they are removed by the purge method. For samples that show how to call conditionalDelete, see Conditionally deleting a FHIR resource.