Graylog on multinode k8s cluster

Hello. Newbie here, so please excuse my lack of knowledge.
What I want to do is have Graylog running on a Kubernetes cluster. I know it is possible, my question is: can I have Graylog running on one node and several Elasticsearch pods running on other nodes? Or is it too much overhead?
Also, as I am not sending or retrieving logs but rather JSON objects, can I connect a Java server with the Graylog API to do so? Or should I just scrap the Graylog part entirely and just go with Java backend server and Elasticsearch?
Thank you. Please be gentle.

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