Solr 6.x : howto create a core in (embedded) CoreConatiner

[Clemens Wyss DEV]

I am still using 5.4.1 and have the following code to create a new core:
...
Properties coreProperties = new Properties();
coreProperties.setProperty( CoreDescriptor.CORE_CONFIGSET, configsetToUse );
CoreDescriptor coreDescriptor = new CoreDescriptor( container, coreName, 
coreFolder, coreProperties );
coreContainer.create( coreDescriptor );
coreContainer.getCoresLocator().create( coreContainer, coreDescriptor );
...

What is the equivalent Java snippet in Solr 6.x (latest greatest)?

Thx & a successful 2017!
Clemens