Data stream compatibility issues upgrading from 8.18 to 9

Elastic Stack Elasticsearch
2

OK, I solved my own issue. I had to use

POST /_migration/reindex
{
    "source": {
        "index": "[data-stream]"
    },
    "mode":"upgrade"
}

for each flagged data stream.

Still other deprecation issues to resolve, but just updating/closing this.

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