# Are NEST and Elasticsearch.NET backward compatible with older versions of ES?

**URL:** <https://discuss.elastic.co/t/are-nest-and-elasticsearch-net-backward-compatible-with-older-versions-of-es/78038>\
**Category:** Elasticsearch\
**Created:** [March 9, 2017, 7:03pm UTC](https://discuss.elastic.co/t/are-nest-and-elasticsearch-net-backward-compatible-with-older-versions-of-es/78038 "2017-03-09T19:03:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![AndyBadera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/andybadera/32/11229_2.png) [@AndyBadera](https://discuss.elastic.co/u/AndyBadera)\
**Post date:** [March 9, 2017, 7:03pm UTC](https://discuss.elastic.co/t/are-nest-and-elasticsearch-net-backward-compatible-with-older-versions-of-es/78038/1 "2017-03-09T19:03:08Z")

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We're running ES 2.4.1 but have developers using 5.x NEST and [Elasticsearch.NET](http://Elasticsearch.NET).

Is this going to present any difficulties?

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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:** [April 6, 2017, 7:03pm UTC](https://discuss.elastic.co/t/are-nest-and-elasticsearch-net-backward-compatible-with-older-versions-of-es/78038/2 "2017-04-06T19:03:11Z")

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