Migrate elasticsearch tar.gz based instance to new debian package based instance

Hello. I've an ES tar.gz based instance running and I would like to migrate it to an ES debian package installation (same version to avoid problems: 6.5.3) in the same machine. Both instance would run as single-node (except maybe while migrating). What's the easiest way to do it? Adding debian package based instance to previous cluster, maybe? How am I supposed to change shard number to do it?
I would be migrating a whole ELK system, but I would start by ES.
Thanks in advance and best regards

If you haven't put the tar.gz in the same place as the deb, then I would install the deb and then either cluster the two nodes and migrate data across with allocation filtering, or copy the tar.gz data directory over to the new node and hope it works.

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