code: @BetaApi
    public static Mutation fromProtoUnsafe(List<com.google.bigtable.v2.Mutation> protos) {
      Mutation mutation = new Mutation(true);
      mutation.mutations.addAll(protos);
      return mutation;
    }
docs: Wraps the List of protobuf {@link com.google.bigtable.v2.Mutation}. This methods, like {@link
  #createUnsafe()}, allows setCell operation to use server side timestamp. This is dangerous
  because mutations will no longer be idempotent, which might cause multiple duplicate values to
  be stored in Bigtable. This option should only be used for advanced usecases with extreme care.