# Help on migration from 1.5 to 6.5

**URL:** <https://discuss.elastic.co/t/help-on-migration-from-1-5-to-6-5/162362>\
**Category:** Elasticsearch\
**Created:** [December 28, 2018, 3:42pm UTC](https://discuss.elastic.co/t/help-on-migration-from-1-5-to-6-5/162362 "2018-12-28T15:42:13Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![thefred](https://avatars.discourse-cdn.com/v4/letter/t/7c8e57/32.png) [@thefred](https://discuss.elastic.co/u/thefred)\
**Post date:** [December 28, 2018, 3:42pm UTC](https://discuss.elastic.co/t/help-on-migration-from-1-5-to-6-5/162362/1 "2018-12-28T15:42:14Z")

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Hello

I'm trying to upgrade an existing elasticSearch on version 1.5.2 to version 6.5.4.

I was wondering if there's any recommendation on converting existing data. I'm able to perform a reload for some of the indices but others I'm afraid it's not possible.

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**Author:** ![Igor\_Motov](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/igor_motov/32/45193_2.png) [@Igor\_Motov](https://discuss.elastic.co/u/Igor_Motov)\
**Post date:** [December 28, 2018, 7:03pm UTC](https://discuss.elastic.co/t/help-on-migration-from-1-5-to-6-5/162362/2 "2018-12-28T19:03:51Z")

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Direct upgrade from such an old version is not supported, so you will have to [reindex all indexes](https://www.elastic.co/guide/en/elasticsearch/reference/5.6/docs-reindex.html#reindex-from-remote), update mappings and change queries. I a lot of things changed since 1.5. We are keeping track of all breaking changes on these pages:

[https://www.elastic.co/guide/en/elasticsearch/reference/2.0/breaking-changes-2.0.html](https://www.elastic.co/guide/en/elasticsearch/reference/2.0/breaking-changes-2.0.html)  
[https://www.elastic.co/guide/en/elasticsearch/reference/5.0/breaking-changes-5.0.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.0/breaking-changes-5.0.html)  
[https://www.elastic.co/guide/en/elasticsearch/reference/6.5/breaking-changes.html](https://www.elastic.co/guide/en/elasticsearch/reference/6.5/breaking-changes.html)

So you will probably have to study these pages and check what applies to your situation.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 25, 2019, 7:16pm UTC](https://discuss.elastic.co/t/help-on-migration-from-1-5-to-6-5/162362/3 "2019-01-25T19:16:16Z")

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