public boolean isInternalRegion() {
    return isInternalRegion;
  }
An internal version of Region Attributes that allows for additional information to be passed to
the Region constructors, typically for internal purposes, for example internally GemFire may need
use a Region and flag it for internal use only.

@since GemFire 4.2.3
geode-core/src/main/java/org/apache/geode/internal/cache/InternalRegionArguments.java