How to filter out certain Log-Types in old Indexes

Hello Guys,

so i've got a little problem on my hands.
I've got an ES-Cluster running just about fine now. Except for DiskSpace. That's (in my opinion) the result of the Month June because in June our huge VM-WareCluster was advised to send every log to Logstash. Now in june i got around 23.000.000 Logs a day, when filtering out Verbose logs, it's around 250.000. So now my question is, is there a way for me to filter out verbose logs in the june indexes.

Greetz
Moritz