code: public boolean containsBetaSettings(
        java.lang.String key) {
      if (key == null) { throw new java.lang.NullPointerException(); }
      return internalGetBetaSettings().getMap().containsKey(key);
    }
docs: <pre>
  Metadata settings that are supplied to this version to enable
  beta runtime features.
  </pre>
  
  <code>map&lt;string, string&gt; beta_settings = 13;</code>