NPM group search document is not invalidated when member search documents change

2017-05-23 15:59:28,235-0400 ERROR [event-7-thread-26] admin com.google.common.eventbus.EventBus.nexus.async - Could not dispatch event com.sonatype.nexus.repository.npm.internal.NpmSearchIndexInvalidatedEvent@3e77c99e to subscriber com.sonatype.nexus.repository.npm.internal.NpmSearchIndexFacetGroup$$EnhancerByGuice$$999fc080@5757b488 method [public void com.sonatype.nexus.repository.npm.internal.NpmSearchIndexFacetGroup.on(com.sonatype.nexus.repository.npm.internal.NpmSearchIndexInvalidatedEvent)]
java.lang.IllegalStateException: Unit of work has not been set
	at com.google.common.base.Preconditions.checkState(Preconditions.java:444) [com.google.guava:21.0.0]
	at org.sonatype.nexus.transaction.UnitOfWork.acquireTransaction(UnitOfWork.java:169) [na:na]
	at org.sonatype.nexus.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:53) [na:na]
	at com.sonatype.nexus.repository.npm.internal.NpmSearchIndexFacetGroup.on(NpmSearchIndexFacetGroup.java:74) [na:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [na:1.8.0_40]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [na:1.8.0_40]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [na:1.8.0_40]
	at java.lang.reflect.Method.invoke(Method.java:497) [na:1.8.0_40]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) [na:na]
	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) [na:na]
	at org.sonatype.nexus.thread.internal.MDCAwareRunnable.run(MDCAwareRunnable.java:40) [org.sonatype.nexus.thread:3.4.0.SNAPSHOT]
	at org.apache.shiro.subject.support.SubjectRunnable.doRun(SubjectRunnable.java:120) [org.apache.shiro.core:1.3.2]
	at org.apache.shiro.subject.support.SubjectRunnable.run(SubjectRunnable.java:108) [org.apache.shiro.core:1.3.2]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_40]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_40]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]