I'm trying to upgrade an existing elasticSearch on version 1.5.2 to version 6.5.4.
I was wondering if there's any recommendation on converting existing data. I'm able to perform a reload for some of the indices but others I'm afraid it's not possible.
Direct upgrade from such an old version is not supported, so you will have to reindex all indexes, update mappings and change queries. I a lot of things changed since 1.5. We are keeping track of all breaking changes on these pages:
So you will probably have to study these pages and check what applies to your situation.
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