public void setIsGatewayTag(boolean isGateway) {
    if (isGateway) {
      setBits(BITS_GATEWAY_TAG);
    } else {
      clearBits(~BITS_GATEWAY_TAG);
    }
  }
@return true if this is a gateway timestamp holder rather than a full version tag
geode-core/src/main/java/org/apache/geode/internal/cache/versions/VersionTag.java