We are in the process of upgrading from 1.6 to 2.1. The logs show a lot of activity with regard to upgrading each index; however, during that time, connections on 9200 are refused. Is that expected behavior?

Elasticsearch unavailable during upgrade

warkolm (Mark Walkom) January 14, 2016, 9:37pm 4

Take a look at Connectivity issues with a new/upgraded 2.X cluster? Read here first :)

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