[release-2.55] TSDB: Backward compatibility with upcoming index v3 #14939
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[re-do of #14934 from @codesome after force-push]
In order to do #14749, we will need an index version bump. Nothing else about how we use the index will change. I propose adding this backward compatibility to 2.55 so that there is a 2.XX version that people can downgrade to from 3.YY.