I'm getting a write speed of 680 KB/s per node for the reindex API.
Cluster is a 16 data node cluster with 3 master nodes. Each data node has 1.3 TB gp3 Disk with 3000 IOPS and 125 MBps throughput.
Reindex API is using a batch of 6176 documents (~ 3MB payload size)
Why is it so slow?