couchdb: Replicate() doesn't return proper status

[flimzy]

It seems that the Replicate() function looks for an id field in the response, and assumes this is a replication doc id. This field doesn't actually appear--at least not always.

From 2.2.0:

{
  "ok": true,
  "session_id": "7f82f0ae7134887bdff049ff79c196ac",
  "source_last_seq": "1-g1AAAAGfeJzLYWBg4MhgTmHgzcvPy09JdcjLz8gvLskBCjMlMiTJ____PyuDOZEhFyjAnmaeamlubpbCwFmal5KalpmXmoJDa5ICkEyyR9FtYGJkYmlqSoxuB5DueKhuRrBuc1NTIwvzZHT1uExIAJlQDzIhkQGHmjwWIMnQAKSAyuYj3JlompacakCMLyEmLICYsJ-QTQcg6u4TUvcAog7k8iwA3at_ug",
  "replication_id_version": 4,
  "history": [
    {
      "session_id": "7f82f0ae7134887bdff049ff79c196ac",
      "start_time": "Sun, 25 Apr 2021 20:03:54 GMT",
      "end_time": "Sun, 25 Apr 2021 20:03:58 GMT",
      "start_last_seq": 0,
      "end_last_seq": "1-g1AAAAGfeJzLYWBg4MhgTmHgzcvPy09JdcjLz8gvLskBCjMlMiTJ____PyuDOZEhFyjAnmaeamlubpbCwFmal5KalpmXmoJDa5ICkEyyR9FtYGJkYmlqSoxuB5DueKhuRrBuc1NTIwvzZHT1uExIAJlQDzIhkQGHmjwWIMnQAKSAyuYj3JlompacakCMLyEmLICYsJ-QTQcg6u4TUvcAog7k8iwA3at_ug",
      "recorded_seq": "1-g1AAAAGfeJzLYWBg4MhgTmHgzcvPy09JdcjLz8gvLskBCjMlMiTJ____PyuDOZEhFyjAnmaeamlubpbCwFmal5KalpmXmoJDa5ICkEyyR9FtYGJkYmlqSoxuB5DueKhuRrBuc1NTIwvzZHT1uExIAJlQDzIhkQGHmjwWIMnQAKSAyuYj3JlompacakCMLyEmLICYsJ-QTQcg6u4TUvcAog7k8iwA3at_ug",
      "missing_checked": 1,
      "missing_found": 1,
      "docs_read": 1,
      "docs_written": 1,
      "doc_write_failures": 0
    }
  ]
}

From 3.0.0:

{
  "ok": true,
  "session_id": "87bf1c2a565f20976c4cb19a22528b7e",
  "source_last_seq": "6-g1AAAABteJzLYWBgYMpgTmHgzcvPy09JdcjLz8gvLskBCScyJNX___8_K4M5kS0XKMBunmRiYmRmhK4Yh_Y8FiDJ0ACk_oNMSWTIAgDY6SGt",
  "replication_id_version": 4,
  "history": [
    {
      "session_id": "87bf1c2a565f20976c4cb19a22528b7e",
      "start_time": "Sun, 25 Apr 2021 19:53:34 GMT",
      "end_time": "Sun, 25 Apr 2021 19:53:35 GMT",
      "start_last_seq": 0,
      "end_last_seq": "6-g1AAAABteJzLYWBgYMpgTmHgzcvPy09JdcjLz8gvLskBCScyJNX___8_K4M5kS0XKMBunmRiYmRmhK4Yh_Y8FiDJ0ACk_oNMSWTIAgDY6SGt",
      "recorded_seq": "6-g1AAAABteJzLYWBgYMpgTmHgzcvPy09JdcjLz8gvLskBCScyJNX___8_K4M5kS0XKMBunmRiYmRmhK4Yh_Y8FiDJ0ACk_oNMSWTIAgDY6SGt",
      "missing_checked": 2,
      "missing_found": 2,
      "docs_read": 2,
      "docs_written": 2,
      "doc_write_failures": 0
    }
  ]
}

Also, the whole way that the replication works seems a bit convoluted. Maybe it can be simplified.