Upgrading to 7.0

We currently have version 6.0.0 of the elk stack which is coming eol mid may. We are looking at the possibility of upgrading to v7. We do have some fields that are not in version 7 (type). Do anyone have any suggestions on what we need to consider before upgrading?

We do have existing data at v6.0.0 which we need to be able view.

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