update indexes
I think the old ones will remain. I'll remove them manually...

These two indexes have been proposed by mongo cloud. The reason is: https://github.com/huggingface/dataset-viewer/pull/2933/files#diff-4c951d0a5e21ef5c719bc392169f41e726461028dfd8e049778fedff37ba38c8R422
update indexes: I think the old ones will remain. I'll remove them manually...

These two indexes have been proposed by mongo cloud. The reason is: https://github.com/huggingface/dataset-viewer/pull/2933/files#diff-4c951d0a5e21ef5c719bc392169f41e726461028dfd8e049778fedff37ba38c8R422