I was able to get rid of the error message (I'm still waiting for data to show up), I'm not sure if this fixes the problem but at least you'll get rid of the error message.
Go to "Index Management" -> Search for the index with issues (from the log above it seems it's ".ds-metrics-apm.internal-default-2022.04.17-000001") -> Select the index -> Go to "Edit Settings" add the following line "system.memory.actual.free", anywhere in the "index.query.default_field" section.
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