Migrating java application to Elasticsearch 8.x from ES 7.17.5

Elastic Stack Elasticsearch
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We are using Elasticsearch 7.17.5 which is used by a Java 8 application. We are planning to upgrade to Elasticsearch 8.x.

Since High-level Rest Client is now deprecated I am unable to resolve dependencies in order to use the HLRC existing code with Elasticsearch Version 8.x.( High Level Client compatibilty with ES 8 )

Which version of elasticsearch-rest-high-level-client should we use?

Also do we need to migrate our java application to java 17?

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