void basicClear(RegionEventImpl regionEvent, boolean cacheWrite) {
    cmnClearRegion(regionEvent, cacheWrite, true);
  }
removes the object from the Map and returns the object removed. The object is returned only if
present in the localMap. If the value is present in another Node, null is returned
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java