Hi @evinasco,
Looks like you want to see size growth of particular index over the time, below approach may help.
| dbinspect index=_internal
| stats sum(sizeOnDiskMB) as size
| eval index_name=_internal
| collect index=main sourcetype=index_growth
Change the _internal with your index name you want to monitor. Run above query in search bar, click on Save as Alert. Select alert type as "Scheduled", select schedule period from below drop-down based on your requirement. Click Save.
In future whenever you want to see the index growth over time write below query to get the timechart.
index=main sourcetype="index_growth" | timechart avg(size) by index_name
Hope this helps!
