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

Topic		Replies	Views
Connection refused after installing new version of elasticsearch Elasticsearch	5	1058	July 5, 2017
Failed to connect to server_name:9200 connection refused Elasticsearch	2	4367	October 10, 2019
Upgrade to 1.2.1, now broken and status yellow Elasticsearch	9	446	July 6, 2017
Connection to localhost:9200 refused Elasticsearch	7	8286	June 2, 2022
Issue post upgrade from version 0.90.5 to 0.9.10 Elasticsearch	1	339	July 6, 2017