# Facing Issue connecting Opensearch v1.3 with elastic search rest client version 7.17.x and using java 1.8

**URL:** <https://discuss.elastic.co/t/facing-issue-connecting-opensearch-v1-3-with-elastic-search-rest-client-version-7-17-x-and-using-java-1-8/382012>\
**Category:** Elastic Search\
**Created:** [September 17, 2025, 11:37am UTC](https://discuss.elastic.co/t/facing-issue-connecting-opensearch-v1-3-with-elastic-search-rest-client-version-7-17-x-and-using-java-1-8/382012 "2025-09-17T11:37:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jay\_Chadawar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jay_chadawar/32/140043_2.png) [@Jay\_Chadawar](https://discuss.elastic.co/u/Jay_Chadawar)\
**Post date:** [September 17, 2025, 11:37am UTC](https://discuss.elastic.co/t/facing-issue-connecting-opensearch-v1-3-with-elastic-search-rest-client-version-7-17-x-and-using-java-1-8/382012/1 "2025-09-17T11:37:17Z")

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deleteOldIndices failed: Elasticsearch version 6 or more is required

org.elasticsearch.ElasticsearchException: Elasticsearch version 6 or more is required

at org.elasticsearch.client.RestHighLevelClient.performClientRequest(RestHighLevelClient.java:2701)

should i upgrade my project to java 11 and use opensaerch rest client or is there any way to connect to opensaerch via Elasticsearch rest client?

even the error does not help it says upgrade to version 6 , dude i am alreadu using elastic version client 7.17.x…

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [September 17, 2025, 12:07pm UTC](https://discuss.elastic.co/t/facing-issue-connecting-opensearch-v1-3-with-elastic-search-rest-client-version-7-17-x-and-using-java-1-8/382012/2 "2025-09-17T12:07:32Z")

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If you are using Opensearch I would recommend using the Opensearch client library.

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**Author:** ![Jay\_Chadawar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jay_chadawar/32/140043_2.png) [@Jay\_Chadawar](https://discuss.elastic.co/u/Jay_Chadawar)\
**Post date:** [September 17, 2025, 12:33pm UTC](https://discuss.elastic.co/t/facing-issue-connecting-opensearch-v1-3-with-elastic-search-rest-client-version-7-17-x-and-using-java-1-8/382012/3 "2025-09-17T12:33:13Z")

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yeah updating ptoject to java 14 and using opensaerch/…

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**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [September 17, 2025, 1:20pm UTC](https://discuss.elastic.co/t/facing-issue-connecting-opensearch-v1-3-with-elastic-search-rest-client-version-7-17-x-and-using-java-1-8/382012/4 "2025-09-17T13:20:33Z")

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Otherwise use the real Elasticsearch 🤭