The feature is available since 10.0.0.Beta1, see issue [WFLY-4377] Add support for Infinispan partition handling - JBoss Issue Tracker .
When I try to use this feature in Wildfly 9 (domain mode) the server will not start due to invalid domain.xml file.
Going forward, I would recommend using the CLI interface to avoid problems like this in the future.
How can we set partition-handling for infinispan when using wildfly 9?
You need to upgrade to WildFly 10.