# Elastic system indices migration issue while upgrade

**URL:** <https://discuss.elastic.co/t/elastic-system-indices-migration-issue-while-upgrade/344434>\
**Category:** Elasticsearch\
**Created:** [October 5, 2023, 1:21am UTC](https://discuss.elastic.co/t/elastic-system-indices-migration-issue-while-upgrade/344434 "2023-10-05T01:21:11Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Harper\_S1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/harper_s1/32/103430_2.png) [@Harper\_S1](https://discuss.elastic.co/u/Harper_S1)\
**Post date:** [October 5, 2023, 1:21am UTC](https://discuss.elastic.co/t/elastic-system-indices-migration-issue-while-upgrade/344434/1 "2023-10-05T01:21:11Z")

</div>

Hi,

I am upgrading elastic from 6.8 to 7.17.0 and then 8.x.x.

From version 6.8 to 7.17 migration was fine but while preparing to migrate from version 7.17 to 8.x.x upgrade assistant is not able to migrate this one(Tasks) hidden indices, others are migrated successfully.

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/8/5/850e72256b321d772549085e6ceefd915bbdfe2b.png)

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/e/0/e09dbd47269e411a8ce1e720954a9aba6b305915.png)

and, in the elastic logs showing the following_rat_ error.

```auto
> [2023-10-04T20:47:34,705][INFO][o.e.u.SystemIndexMigrator] 
[xyz.server.com] preparing to migrate old index [.tasks] from feature [tasks] to new index [.tasks-reindexed-for-8]
[2023-10-04T20:47:34,765][INFO][o.e.u.SystemIndexMigrator] [xyz.server.com] migrating index [.tasks] from feature [tasks] to new index [.tasks-reindexed-for-8]
[2023-10-04T20:47:34,767][INFO][o.e.c.m.MetadataCreateIndexService] [xyz.server.com] failed on parsing mappings on index creation [.tasks-reindexed-for-8]
> org.elasticsearch.index.mapper.MapperParsingException: 
Failed to parse mapping [_doc]: Root mapping definition has unsupported parameters: [task : {_meta={version=7.17.0}, dynamic=strict, properties={task={properties={node={type=keyword}, headers={type=object, enabled=false}, 
parent_task_id={type=keyword}, running_time_in_nanos={type=long}, action={type=keyword}, 
description={type=text}, start_time_in_millis={type=long}, id={type=long}, type={type=keyword}, cancellable={type=boolean}, status={type=object, enabled=false}}}, response={type=object, enabled=false}, completed={type=boolean}, error={type=object, enabled=false}}}]

```

Could someone please help on this.

Thanks!

---

<div class="post-metadata">

**Author:** ![Faker](https://avatars.discourse-cdn.com/v4/letter/f/eb9ed0/32.png) [@Faker](https://discuss.elastic.co/u/Faker)\
**Post date:** [October 5, 2023, 6:10am UTC](https://discuss.elastic.co/t/elastic-system-indices-migration-issue-while-upgrade/344434/2 "2023-10-05T06:10:48Z")

</div>

have you tried **Restore an entire cluster**?  
[elastic.co/guide](https://www.elastic.co/guide/en/elasticsearch/reference/7.17/snapshots-restore-snapshot.html#restore-entire-cluster)

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 2, 2023, 6:11am UTC](https://discuss.elastic.co/t/elastic-system-indices-migration-issue-while-upgrade/344434/3 "2023-11-02T06:11:15Z")

</div>

Closed on November 2, 2023, 6:11am UTC

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