void clearBucketRegion(BucketRegion br) {
    Assert.assertTrue(realBucket == br);
    realBucket = null;
  }
Notify this proxy of the real bucket as its target. Future calls to this instance will then
proxy them back to the real bucket.

@param br the real bucket which will be the target for this proxy
geode-core/src/main/java/org/apache/geode/internal/cache/ProxyBucketRegion.java