code: public boolean containsMountPoints(
        java.lang.String key) {
      if (key == null) { throw new java.lang.NullPointerException(); }
      return internalGetMountPoints().getMap().containsKey(key);
    }
docs: <code>map&lt;string, .alluxio.grpc.file.MountPointInfo&gt; mountPoints = 1;</code>