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62d8b7ab97
When reading the [rolling upgrade process](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/setup-upgrade.html#rolling-upgrades), you can see that we wrote: * disable allocation * upgrade node1 * upgrade node2 * upgrade node3 * ... * enable allocation That won't work as after a node has been removed and restarted, no shard will be allocated anymore. So closing node2 and remaining nodes, won't help to serve index and search request anymore. We should write: * disable allocation * upgrade node1 * enable allocation * wait for shards being recovered on node1 * disable allocation * upgrade node2 * enable allocation * wait for shards being recovered on node2 * disable allocation * upgrade node3 * enable allocation * wait for shards being recovered on node3 * disable allocation * ... * enable allocation I think this documentation update should go in 1.3, 1.4, 1.x and master branches. Closes #8218 Closes #7973.