We recently upgraded 4.5 index to 6.5 using IndexUpgrader. The index size is around 600 GB on disk. When we try to split it using SPLITSHARD, it creates two new sub shards on the node and eventually crashes before completely the split. After restart, the original shard size if around 100 GB and each sub shards are around 2 GB. They are no doubt not fully constructed.
We tried different heap settings as well- 15, 20 and 30 GB, but it always crashed. RAM is about 256GB. What's going on here? Any one faced this situation before?
