Update default index settings

i created 2 new Indices, and i updated default index settings as below:
Before Update
Select rotation strategy: index message count
max document per index : 20000000
Select retention strategy: delete
Max number of indices : 10

After Update :

Select rotation strategy: index size
max index size : 1 GB
Select retention strategy: delete
Max number of indices : 10
but the default index space remains 79 GB after the update , as appear in the attached screenshot
why default index space not changed after the update

he @ahmadtamimi

the update does not force any recreation or rotation. You have set a specific size to rotate - but you have configured Graylog to hold 10 indices. Currently you have 2 indices. When the 11th is created the first will be deleted.

If you want to free space, you can click on the index name and select the indices manually and hit the delete button.

does that work for you?