Cannot Upgarde from 6.71 to 7.0

Hallo , I am absolut beginner.I cannot Upgrade from 6.7.1 to 7.0 and above .
Can sombody guide me ?

As of 7.0, you must tell Elasticsearch what the nodes in your cluster are if you're running in production mode. If you want to run in development mode, rather than production mode, you can set discovery.type: single-node in elasticsearch.yml, but this will limit your cluster to a single node and disable some other checks which help ensure that your cluster will run in a stable and performant manner.

You can find the documentation for this in the docs for bootstrapping a cluster and the docs for the discovery settings.

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