You can actually reference the license usage logs for this:
index=_internal source=*license_usage.log type=Usage earliest=-1d@d latest=-0d@d | stats sum(b) by st, idx | rename sum(b) as Bytes | eval Volume=round(Bytes/1024/1024, 2) | eventstats sum(Volume) as Total_Volume | fields - Bytes | fieldformat Volume = tostring(Volume, "commas") +"MB" | fieldformat Total_Volume = tostring(Total_Volume, "commas") +"MB" | rename st as Sourcetype, idx as Index
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