To enable Azure repositories, you have first to define your azure storage settings as secured settings:

bin/elasticsearch-keystore add azure.client.default.account
bin/elasticsearch-keystore add azure.client.default.key

Where account is the azure account name and key the azure secret key.

Note that you can also define more than one account:

bin/elasticsearch-keystore add azure.client.default.account
bin/elasticsearch-keystore add azure.client.default.key
bin/elasticsearch-keystore add azure.client.secondary.account
bin/elasticsearch-keystore add azure.client.secondary.key

default is the default account name which will be used by a repository unless you set an explicit one.

You can set the client side timeout to use when making any single request. It can be defined globally, per account or both. It’s not set by default which means that Elasticsearch is using the default value set by the azure client (known as 5 minutes).

max_retries can help to control the exponential backoff policy. It will fix the number of retries in case of failures before considering the snapshot is failing. Defaults to 3 retries. The initial backoff period is defined by Azure SDK as 30s. Which means 30s of wait time before retrying after a first timeout or failure. The maximum backoff period is defined by Azure SDK as 90s.

endpoint_suffix can be used to specify Azure endpoint suffix explicitly. Defaults to core.windows.net.

cloud.azure.storage.timeout: 10s
azure.client.default.max_retries: 7
azure.client.default.endpoint_suffix: core.chinacloudapi.cn
azure.client.secondary.timeout: 30s

In this example, timeout will be 10s per try for default with 7 retries before failing and endpoint suffix will be core.chinacloudapi.cn and 30s per try for secondary with 3 retries.

You can register a proxy per client using the following settings:

azure.client.default.proxy.host: proxy.host
azure.client.default.proxy.port: 8888
azure.client.default.proxy.type: http

Supported values for proxy.type are direct (default), http or socks. When proxy.type is set to http or socks, proxy.host and proxy.port must be provided.

# The simpliest one
PUT _snapshot/my_backup1
{
    "type": "azure"
}

# With some settings
PUT _snapshot/my_backup2
{
    "type": "azure",
    "settings": {
        "container": "backup-container",
        "base_path": "backups",
        "chunk_size": "32m",
        "compress": true
    }
}


# With two accounts defined in elasticsearch.yml (my_account1 and my_account2)
PUT _snapshot/my_backup3
{
    "type": "azure",
    "settings": {
        "client": "secondary"
    }
}
PUT _snapshot/my_backup4
{
    "type": "azure",
    "settings": {
        "client": "secondary",
        "location_mode": "primary_only"
    }
}

client.admin().cluster().preparePutRepository("my_backup_java1")
    .setType("azure").setSettings(Settings.builder()
        .put(Storage.CONTAINER, "backup-container")
        .put(Storage.CHUNK_SIZE, new ByteSizeValue(32, ByteSizeUnit.MB))
    ).get();