the create core admin command don't take into account the transient core property, when the core is registered (so, the core will be never closed by the transient core cache)
To reproduce :
set transientCacheSize=2 and start with no cores
Create 3 cores :
Look at the status :
All cores are still loaded.
One core should not be loaded (closed by the transient cache)
The patch in attachment is for svn solr branch_4X (revision number 1526418)