Error migrating kibana 5.4 to 5.6

[parosio]

Hello,
we're having trouble in migrating .kibana index from 5.4.0 to 5.6.5 (in order to prepare it to a final migration to 6.5).
We're testing it in a single-node environment.

We follow the instructions for a manual upgrade:

0. make a copy of current .kibana => .kibana-backup-5-4
1. Set .kibana index to read-only
2. Create a .kibana-6 with the new mapping, with both "index.mapper.dynamic": false, and "index.mapping.single_type": true
   2.1 Reindex .kibana into .kibana-6
   2.2 Alias .kibana-6 to .kibana and remove legacy .kibana index

When starting kibana we have errors from the plugins, as the index rejects multiple types:

  log   [16:02:47.782] [error][status][plugin:xpack_main@5.6.5] Status changed from yellow to red - [illegal_argument_exception] Rejecting mapping update to [.kibana-6] as the final mapping would have more than 1 type: [doc, config]
...
  log   [16:02:47.791] [error][status][plugin:searchprofiler@5.6.5] Status changed from uninitialized to red - [illegal_argument_exception] Rejecting mapping update to [.kibana-6] as the final mapping would have more than 1 type: [doc, config]

then it continues trying to create new type(s) in .kibana:

  log   [16:02:48.487] [info][status][plugin:timelion@5.6.5] Status changed from uninitialized to green - Ready
  log   [16:02:48.494] [info][listening] Server running at http://localhost:5601
  log   [16:02:48.496] [error][status][ui settings] Status changed from uninitialized to red - Elasticsearch plugin is red
  ops   [16:02:50.131]  memory: 916.1MB uptime: 0:06:48 load: [1.20 1.05 0.80] delay: 2.538
  log   [16:02:50.291] [debug][plugin] Checking Elasticsearch version
  log   [16:02:50.318] [info][elasticsearch] Adding mappings to kibana index for SavedObject type "config"
  log   [16:02:50.735] [debug][esqueue][reporting][worker] jsvypf730e6yb7e9b7c1b769 - querying for outstanding jobs
  log   [16:02:50.741] [debug][esqueue][reporting][worker] jsvypf730e6yb7e9b7c1b769 - 0 outstanding jobs returned
  log   [16:02:52.842] [debug][plugin] Checking Elasticsearch version
  log   [16:02:52.864] [info][elasticsearch] Adding mappings to kibana index for SavedObject type "config"
  log   [16:02:53.748] [debug][esqueue][reporting][worker] jsvypf730e6yb7e9b7c1b769 - querying for outstanding jobs
  log   [16:02:53.755] [debug][esqueue][reporting][worker] jsvypf730e6yb7e9b7c1b769 - 0 outstanding jobs returned
  ops   [16:02:55.132]  memory: 917.2MB uptime: 0:06:53 load: [1.10 1.03 0.80] delay: 2.328

In Elasticsearch, we keep having:

  [2019-03-05T17:03:43,792][DEBUG][o.e.a.a.i.m.p.TransportPutMappingAction] [mCMhoMa] failed to put mappings on indices [[[.kibana-6/mRl4HsY_TWKlH8aItayVzw]]], type [config]
  java.lang.IllegalArgumentException: Rejecting mapping update to [.kibana-6] as the final mapping would have more than 1 type: [doc, config]
  ...

We've tried also with the migration UI from x-pack, but with no better results.

Any advice is welcome,
Regards

[parosio]

Seems that moving through 5.6 isn't really necessary. It's cause of troubles, actually.

It'd been sufficient to move data to a fresh new 6.6 installation. Then, the new mapping has been put for .kibana-6, and the old .kibana documents have been reindexed to the newly created .kibana-6.