Update v3 rolling upgrade instructions with minimum version requirement #11364
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Added note about minimum required cluster version for upgrades to 3.x.x.
Description
For a v2->v3 rolling upgrade to work smoothly, the minimum required version is v2.19.0.
This is not currently not listed in the page, so people (like myself) can try rolling upgrade e.g., from 2.18.0 to 3.2.0 which fails.
More info: opensearch-project/OpenSearch#19375
Version
3.0.0
Checklist
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