Optimization feature cannot triggered by enabling the document-optimization-child-count-target in Wildfly configuration

   <repository name="sample"
      document-optimization-child-count-target="1000"
      document-optimization-child-count-tolerance="10"
      document-optimization-initial-time="02:00"
      document-optimization-interval="24"
      document-optimization-thread-pool="modeshape-opt"
/>

    16:16:35,448 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-8) MSC000001: Failed to start service jboss.modeshape.sample.repository: org.jboss.msc.service.StartException in service jboss.modeshape.sample.repository: org.modeshape.jcr.ConfigurationException: The configuration for the 'sample' repository has problems: ERROR: Error at storage.optimization : The 'optimization' field on 'storage' is not defined in the schema and the schema does not allow additional properties.  
        at org.modeshape.jboss.service.RepositoryService.start(RepositoryService.java:193)  
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]  
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]  
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_20]  
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_20]  
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_20]  
    Caused by: org.modeshape.jcr.ConfigurationException: The configuration for the 'sample' repository has problems: ERROR: Error at storage.optimization : The 'optimization' field on 'storage' is not defined in the schema and the schema does not allow additional properties.  
        at org.modeshape.jcr.ModeShapeEngine.deploy(ModeShapeEngine.java:480)  
        at org.modeshape.jcr.ModeShapeEngine.deploy(ModeShapeEngine.java:452)  
        at org.modeshape.jboss.service.RepositoryService.start(RepositoryService.java:191)  
        ... 5 more