Architecture question re cluster and replica set with single node each

Working on designing our first Graylog implementation. We’re starting with two VMs as a proof of concept and plan to expand later on to the six VM architecture. Should we configure both the OpenSearch cluster and the MongoDB replica set now, even though both will initially have only one node?

As far as i know you could expand to multiple nodes later, but it requires configuration changes on the front end and backend when using multiple opensearch nodes.

We have a one node testing setup with everything to test and make configurations that is later used in production to keep that as clean as possible.

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