when downgrading version 8.11 to a lower version. my datanodes did restore on version downgrade but starting elastic search the data on the new nodes was not found. Is there any way to restore this data?

[leandrojmp (Leandro Pereira)]

@Cody-Test

Hello friend, currently my lab tests elasticsearch when downgrading version 8.11 to a lower version. my datanodes did restore on version downgrade but starting Elasticsearch the data on the new nodes was not found. Is there any way to restore this data?

Elasticsearch does not support downgrade, once you upgrade a node you cannot downgrade it.

If I'm not wrong your data is still there, but the shards can not be allocated, you need to bring the nodes back to the version you had upgrade before.