What are the ways to migrate indices from 1.x to 7.x?

We have an old version of elasticsearch(1.7) and we are trying to migrate that to version 7.2
Is there a way to migrate the current 1.7 indices to 7.x indices ?

I would recommend checking out the reindex-from-remote function: https://www.elastic.co/guide/en/elasticsearch/reference/7.4/reindex-upgrade-remote.html

It is worth noting though, that you'll likely have to specify an ingest node pipeline to change the documents (for example, to manage the _type removal) when indexing the documents, so it's best to test with a small subset of the documents at first.

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