# NEST v7 backwards compatibility

**URL:** <https://discuss.elastic.co/t/nest-v7-backwards-compatibility/186420>\
**Category:** Elasticsearch\
**Created:** [June 19, 2019, 9:22am UTC](https://discuss.elastic.co/t/nest-v7-backwards-compatibility/186420 "2019-06-19T09:22:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![olid](https://avatars.discourse-cdn.com/v4/letter/o/e99b99/32.png) [@olid](https://discuss.elastic.co/u/olid)\
**Post date:** [June 19, 2019, 9:22am UTC](https://discuss.elastic.co/t/nest-v7-backwards-compatibility/186420/1 "2019-06-19T09:22:47Z")

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We have some C# client code that currently talks to two clusters using NEST, both of which are on ElasticSearch 6.x, however we want to upgrade one of the clusters to ES 7.

From searches on this forum it looks like NEST v6 client won't work with ElasticSearch 7, however if we upgrade our NEST client to v7, will that still be able to talk to our ElasticSearch 6.x cluster?

Apologies if this is in docs, I've not been able to find it.

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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:** [July 17, 2019, 9:33am UTC](https://discuss.elastic.co/t/nest-v7-backwards-compatibility/186420/2 "2019-07-17T09:33:37Z")

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