Import index from another Elasticsearch

Elastic Stack Elasticsearch
1

I have two Elasticsearch in same system and I want index with it's data from first Elasticsearch to second one in new index.
How it's done?

2

Snapshot / restore
Or
Reindex from remote

3

can you provide some details how to do that.
documentation may help

4

And

5

By mistake I collapsed Elasticsearch files, now its not working. I downloaded new files of same version, could I able to retrieve my previous index from that old folder.

6

Have you taken snapshot of older index? If Yes follow restore API given on official doc

7

Nope. Is there any other option to retrieve by replacing indices folder structure on data folder

8

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