private void distributedUnlockForClear() {
    if (!scope.isGlobal()) {
      try {
        getLockService().unlock("_clearOperation");
      } catch (IllegalStateException e) {
        lockCheckReadiness();
        throw e;
      }
    }
  }
Release the distributed lock for the clear operation.
geode-core/src/main/java/org/apache/geode/internal/cache/DistributedRegion.java