Migrate Datastreams

Hello,
I'm trying to migrate to a new server and a new cluster.
My Data pipeline's output is being now on the new server, and I'm starting to receive data. However I can't restore my old data using _reindex neither Elasticdump because I receive an error "only write ops with an op_type of create are allowed in data streams"
and whenever I add the option :
"op_type": "create"
The I receive data but indexed with the current date and not with the date on the old server.