private synchronized void forceNewMembershipVersion() {
      if (!closed) {
        incrementMembershipVersion();
        previousVersionOpCount += currentVersionOpCount;
        currentVersionOpCount = 0;
        membershipVersionChanged();
      }
    }
Create a new version of the membership profile set. This is used in flushing state out of the
VM for previous versions of the set.

@since GemFire 5.1
geode-core/src/main/java/org/apache/geode/distributed/internal/DistributionAdvisor.java