Upgrade Elasticsearch

NOTE: It’s highly recommended to perform a backup before any upgrade.

Since version 0.90.7, Elasticsearch supports rolling upgrades. As a result, it’s not necessary to stop the entire cluster during the upgrade process. Instead, it is possible to upgrade one node at a time and keep the rest of the cluster operating normally.

To upgrade a node, follow the steps below:

• Disable shard reallocation using the command below:

    $ curl -XPUT localhost:9200/_cluster/settings -d '{
        "transient" : {
            "cluster.routing.allocation.enable" : "none"
        }
    }'
  

• Stop the node:

    $ sudo /opt/bitnami/ctlscript.sh stop elasticsearch
  

• Download the latest version from [elastic.co] (https://www.elastic.co/)

• Extract to a new directory (not overwriting the current installation) - for example, /tmp/new_elasticsearch.

• Rename old files:

    $ cd /opt/bitnami
    $ sudo mv elasticsearch/bin elasticsearch/old_bin
    $ sudo mv elasticsearch/lib elasticsearch/old_lib
    $ sudo mv elasticsearch/modules elasticsearch/old_modules
  

• Copy files from new installation directory:

    $ sudo cp -r /tmp/new_elasticsearch/bin elasticsearch/bin
    $ sudo cp -r /tmp/new_elasticsearch/lib elasticsearch/lib
    $ sudo cp -r /tmp/new_elasticsearch/modules elasticsearch/modules
  

• Start the node again:

    $ sudo /opt/bitnami/ctlscript.sh start elasticsearch
  

• Re-enable shard reallocation:

    $ curl -XPUT localhost:9200/_cluster/settings -d '{
        "transient" : {
            "cluster.routing.allocation.enable" : "all"
        }
    }'
  

Repeat the process for all remaining nodes of your cluster.