@type t() ::
  %Milvex.Milvus.Proto.Feder.DescribeSegmentIndexDataResponse.IndexDataEntry{
    __protobuf__: true,
    __unknown_fields__: [Protobuf.unknown_field()],
    key: integer(),
    value: Milvex.Milvus.Proto.Feder.SegmentIndexData.t() | nil
  }