We're trying to make the transition from v1 to v3 easier by brining the write and query APIs from that version forward. We wanted to do the same for Flux, but found it was too difficult in the near term. We might be able to do something in the future, but for now we're focused on making core improvements to the v3 engine.

We'll have data migration tools for v1 and v2 into v3 later this year/early next.