The DirectoryProviderFactory hardcodes the "infinispan" directory provider shortcut to "org.hibernate.search.infinispan.spi.InfinispanDirectoryProvider" implementation class and this cannot be overridden.
As the infinispan directory provider is moving away from hibernate search, it'd be desirable to be able to switch the implementation for the "infinispan" key without relying on hardcoded values inside the engine.