code: public boolean containsUsedBytesOnTiers(
        java.lang.String key) {
      if (key == null) { throw new java.lang.NullPointerException(); }
      return internalGetUsedBytesOnTiers().getMap().containsKey(key);
    }
docs: <code>map&lt;string, int64&gt; usedBytesOnTiers = 9;</code>