Cache creation wizard: Not possible to create cache with Volatile indexing storage

Create new cache and choose `Indexed` feature. For indexing Storage type, choose `Volatile` option.

Then go next and next without changing anything.

In cache configuration preview page, we see the following config for indexing part:

"indexing":

{       "enabled": true,       "storage": *"local_heap",*       "indexed-entities": [         "org.infinispan.Person"       ]     }

After clicking `Create` button, I am getting error (see attachment). That happens because the `storage` is set to `local_heap`,but should be `local-heap`.