private PoolImpl getPool() {
    PoolImpl result = null;
    if (getPoolName() != null) {
      result = poolFinder.find(getPoolName());
    }
    return result;
  }
Returns the pool this region is using or null if it does not have one or the pool does not
exist.

@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/internal/cache/AbstractRegion.java