Multiple aggregations (first sum, then max) in ES



I am using Grafana 6.0.2 with Elasticsearch.
I need a graph where I can sum a metric per raw time slot and then draw the max per day.

I have multiple servers. They deliver one metric every 5 minutes. I want to sum this metric over all servers so that I have one value per time slot (5 minutes).
But I don’t want to see every 5 minutes interval. I only need the max value per day.
If I choose the max aggregation I only get the max value per server and not the max value of the sum over all servers…

Do anyone have an idea how to realize it?

Thanks and best regards,