How would I calculate the percentage increase/decrease, for indexes on a per-day basis?
If you are using indexer discovery, this becomes very easy to solve.
On the cluster master UI, go to Settings > Monitoring Console (black bar) > Indexing (grey bar) > Index Detail: Deployment.
That interface will provide all the information you are seeking, and then some.
If this suggestion resolved your issue, please consider accepting the answer, as it benefits others.
Try this as a starting point:
(index=_internal source=*license_usage.log* type="Usage") | eval idx=if(((len(idx) == 0) OR isnull(idx)),"(UNKNOWN)",idx) | search idx=YOURINDEXNAME | bin span=1d _time | stats sum(b) as bytes by _time,idx | delta bytes as change | eval perc=round((change/bytes)*100,2)
Have you looked at the licensing reports? These will indicate the daily licence usage (volume indexed) for each index (or sourcetype).
I have, but there are no built-in searches/reports for % increase/decrease on a daily/monthly/etc basis
Increase/decrease of what?
I've tried using timewrap, but I don't think I'm using it crrectly?
index=_internal source=*license_usage.log type="Usage" earliest=-1w@d | eval Date=strftime(_time, "%Y/%m/%d") | eventstats sum(b) as volume by idx, Date | eval GB=round(volume/1024/1024/1024,5) | timechart first(GB) AS volume by idx | timewrap 1w
sorry about that - of the index size growth/shrinkage