Is it safe to delete Gralog Indexes
you can freely delete your indexes (from the indexes panel) in either graylog or elasticsearch, just recalculate your indexes after.
you may want to update your retention policy to fit your storage availability.
I would rotate them based on space, and then only keep the number of indexes you have room for.
example, rotate every 10G, keep last 7, assuming you have about 85G of free space. (not exactly numbers but a good baseline)
Select System, Indexes
Click UPdate Configuration
Set rotation type to Size
