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.
Steps:
Take backup of Core elasticsearch indexes
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 http://localhost:9200/_snapshot/azurebackup/_all | jq
The above command will give you the snapshot name - "snapshot": "snapshot_1563878417" and "state": "SUCCESS"