We're upgrading our site from D7 to D8, which has vocabulary containing multi-level parent-child hierarchy. The list is too long (around 5K-10K terms) to import manually.
How can we get it working for importing term with hierarchy. The value it accepts for parent is term id. If we pass the parent name (as we're importing it for first-time), it creates the term at root level. Are we missing anything? If we can not do this only with these modules, how can we extend these modules. References would also greatly appreciated.