# Upgrading indexes to elasticsearch 5.x

**URL:** <https://discuss.elastic.co/t/upgrading-indexes-to-elasticsearch-5-x/104205>\
**Category:** Elasticsearch\
**Created:** [October 17, 2017, 8:19am UTC](https://discuss.elastic.co/t/upgrading-indexes-to-elasticsearch-5-x/104205 "2017-10-17T08:19:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dawiro](https://avatars.discourse-cdn.com/v4/letter/d/71e660/32.png) [@dawiro](https://discuss.elastic.co/u/dawiro)\
**Post date:** [October 17, 2017, 8:19am UTC](https://discuss.elastic.co/t/upgrading-indexes-to-elasticsearch-5-x/104205/1 "2017-10-17T08:19:40Z")

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Hi,  
I'm preparing to upgrade an elasticsearch 2.x cluster to 5.6.3. I'm comfortable with the process generally but have a query regarding the handling of mappings which I hope someone can clarify for me...

That is, if I halt ingestion mid-day, after the upgrade, the current index will be a 2.x index with a 2.x template applied, until it rolls at midnight. Given the mapping changes in 5.x how should I handle this? Won't writes to the active index fail?

Regards,  
David

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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:** [November 14, 2017, 8:19am UTC](https://discuss.elastic.co/t/upgrading-indexes-to-elasticsearch-5-x/104205/2 "2017-11-14T08:19:53Z")

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