public void setCacheInVMs(VM... vms) {
    for (VM vm : vms) {
      vm.invoke(this::getAvailableCacheElseCreateCache);
    }
  }
During validation all region operations are paused for a while. Validation happens multiple time
during one test run on a fixed time interval.
geode-core/src/distributedTest/java/org/apache/geode/cache/query/internal/index/ConcurrentIndexUpdateWithoutWLDUnitTest.java