Remove existing _es090* files since Bloom filters are now deprecated?

[SjonHortensius]

After upgrading to 1.5.0 which includes #8571 I was hoping I could free up some diskspace from our nodes. Is there a way to remove the *_es090 files (since they are unused) now that the functionality is deprecated or do I need to wait for the entire functionality to be removed as well?

[mikemccand]

You cannot [easily] remove these files from existing shards, however natural merging over time will remove them since the newly merged segment will not write any bloom filters.

[SjonHortensius]

Okay so the only way to get rid of them would be to ex&import existing data to a new index on e/s 1.5 which will then not write the bloom filters? The es090* consumes roughly 40% of our disk-space so this might actually be an interesting option for us

[mikemccand]

Hang on: it's only the .blm files that will go away, and this almost certainly should not be 40% of your index...

[SjonHortensius]

Ah, you're right; that is actually less then 1%. So maybe this isn't as interesting as I thought. Thanks!