Do I need to open closed indexes when upgrading ES?

Elastic Stack Elasticsearch
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Hi All,

For either minor or major ES upgrade (1.7.0 to 2.0.0 or 2.2.0 to 2.3.3), do I need to reopen closed indexes (lots of them) either before or after the upgrade to have those indexes upgraded to newer version?

Thanks,

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I recently upgraded es cluster from 1.7.4 to 2.3.2, before upgrade I closed all the indices and opened them up after the upgrade.

Ended up several shards at random being not initialized at all

/_cluster/reroute?explain gives me this answer

                    "unassigned_info": {
                       "reason": "INDEX_REOPENED",
                       "at": "2016-05-20T05:31:35.421Z"
                    }

However, when I did upgrade without close/open indices, upgraded es cluster would never finish initializing shards, stuck in recovery process, emitting OOM in a few nodes repeatedly.

Well..this upgrade process is not easy for a medium-sized cluster.