On MC (monitoring console) is own dashboard to show license usage. There are some selection by which you can see values. Just go
Settings -> Monitoring Console
Indexing -> License Usage -> Historic License Usage
then Split By: By Index
Otherwise if you have all in one server you could check this also from
Settings -> Licensing
Usage Report
Previous 60 days
Split by: index
Those both shows by N (10?) biggest indexes. If you want to check some specific index then just copy that query by opening it from magnify glass.
Then modify it something like
index=_internal idx=<YOUR INDEX NAME>
[ `set_local_host`] source=*license_usage.log* type="Usage"
| eval h=if(len(h)=0 OR isnull(h),"(SQUASHED)",h)
| eval s=if(len(s)=0 OR isnull(s),"(SQUASHED)",s)
| eval idx=if(len(idx)=0 OR isnull(idx),"(UNKNOWN)",idx)
| bin _time span=1d
| stats sum(b) as b by _time, pool, s, st, h, idx
| timechart span=1d sum(b) AS volumeB by idx fixedrange=false
| join type=outer _time
[ search index=_internal idx=<YOUR INDEX NAME>
[ `set_local_host`] source=*license_usage.log* type="RolloverSummary" earliest=-30d@d
| eval _time=_time - 43200
| bin _time span=1d
| dedup _time stack
| stats sum(stacksz) AS "stack size" by _time]
| fields - _timediff
| foreach *
[ eval <<FIELD>>=round('<<FIELD>>'/1024/1024/1024, 3)]
r. Ismo
