# Clarify high level REST client compatibility between 6 and 7

**URL:** <https://discuss.elastic.co/t/clarify-high-level-rest-client-compatibility-between-6-and-7/241973>\
**Category:** Elasticsearch\
**Tags:** language-clients\
**Created:** [July 21, 2020, 6:41am UTC](https://discuss.elastic.co/t/clarify-high-level-rest-client-compatibility-between-6-and-7/241973 "2020-07-21T06:41:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![CanardMoussant](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/canardmoussant/32/45421_2.png) [@CanardMoussant](https://discuss.elastic.co/u/CanardMoussant)\
**Post date:** [July 21, 2020, 6:41am UTC](https://discuss.elastic.co/t/clarify-high-level-rest-client-compatibility-between-6-and-7/241973/1 "2020-07-21T06:41:19Z")

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I have traffic coming in constantly in my application and I need to migrate from ES6 to 7. According to the doc the client should be migrated last. But will a client 6 work with a cluster in version 7? How this should be handled? I am surprised the migration guide does not mention this, I must be missing something obvious.

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [July 23, 2020, 7:46am UTC](https://discuss.elastic.co/t/clarify-high-level-rest-client-compatibility-between-6-and-7/241973/3 "2020-07-23T07:46:17Z")

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As long as you are not using any deprecated features you should be able to use the v6 REST client against the v7 cluster. The [deprecation logger](https://www.elastic.co/guide/en/elasticsearch/reference/current/logging.html#deprecation-logging) and the [upgrade assistant](https://www.elastic.co/blog/upgrading-the-elastic-stack-with-the-7-x-upgrade-assistant) will help you find whether you're using any deprecated features. Make sure to run the latest v6.8 release to get the most up-to-date implementation of the upgrade assistant.

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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:** [August 20, 2020, 7:46am UTC](https://discuss.elastic.co/t/clarify-high-level-rest-client-compatibility-between-6-and-7/241973/4 "2020-08-20T07:46:30Z")

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