We are using a get-all subscriber to one ES cluster to get all events,
and then write them into another one. However, there seems to be
reordering going on when writing to the new cluster, which is bad. Is
there a way to ensure that the order events are written to a
connection is the same they will be stored? I could wait for each
event to be individually written, but that would be crazy slow. So
basically, batched ordered writes is what I'm asking for.