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Core Elasticsearch has been upgraded from 5.x version to 6.x. This is done in order to remove overheads in maintaining two versions of elasticsearch - One for Core services and other for Knowledge Platform. With this upgrade, we will be able to use a single elasticsearch cluster for both Core services and Knowledge Platform thereby benefitting in cost and maintenance. Please follow the below steps for this process.

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Switch to root user and ensure you have these values available in elasticsearch.yml file under /etc/elasticsearch/your_node_name/elasticseach.yml

cloud.azure.storage.default.account:              # Your azure backup account name

cloud.azure.storage.default.key:                     # Your azure backup account key

Install elastisearch azure plugin if its not already installed

export ES_PATH_CONF=/etc/elasticsearch/your_node_name

cd /usr/share/elasticsearch/

bin/elasticsearch-plugin install repository-azure

Restart elasticsearch service 

sudo systemctl restart your_node_name_elasticsearch.service

curl -XPUT http://localhost:9200/_snapshot/azurebackup -H 'Content-Type: application/json' -d '{ "type": "azure", "settings": { "container": "elasticsearch-snapshots", "base_path": "application_elasticsearch"} }'

curl -XPUT http://localhost:9200/_snapshot/azurebackup/snapshot_back_name?wait_for_completion=true -H 'Content-Type: application/json' -d '{"include_global_state": false}'

Install jq:

sudo apt-get install jq

Verify your backup was successful - curl  curl http://localhost:9200/_snapshot/azurebackup/_all | jq

The above command will give you the snapshot name - "snapshot": "snapshot_1563878417" and "state": "SUCCESS"

Login to azure and verify in the storage account that backup files are created. The container name will be elasticsearch-snapshots and blob name will be application_elasticsearch

For more info and advanced configurations, please refer https://www.elastic.co/guide/en/elasticsearch/plugins/current/repository-azure-repository-settings.html