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Showing content from http://docs.aws.amazon.com/iot/latest/developerguide/opensearch-rule-action.html below:

OpenSearch - AWS IoT Core

OpenSearch

The OpenSearch (openSearch) action writes data from MQTT messages to an Amazon OpenSearch Service domain. You can then use tools like OpenSearch Dashboards to query and visualize data in OpenSearch Service.

Requirements

This rule action has the following requirements:

An IAM role that AWS IoT can assume to perform the es:ESHttpPut operation. For more information, see Granting an AWS IoT rule the access it requires.

In the AWS IoT console, you can choose or create a role to allow AWS IoT to perform this rule action.
If you use a customer managed AWS KMS key to encrypt data at rest in OpenSearch Service, the service must have permission to use the KMS key on the caller's behalf. For more information, see Encryption of data at rest for Amazon OpenSearch Service in the Amazon OpenSearch Service Developer Guide.

Parameters

When you create an AWS IoT rule with this action, you must specify the following information:

Limitations

The OpenSearch (openSearch) action cannot be used to deliver data to VPC Elasticsearch clusters.

Examples

The following JSON example defines an OpenSearch action in an AWS IoT rule and how you can specify the fields for the OpenSearch action. For more information, see OpenSearchAction.

{
    "topicRulePayload": {
        "sql": "SELECT *, timestamp() as timestamp FROM 'iot/test'",
        "ruleDisabled": false,
        "awsIotSqlVersion": "2016-03-23",
        "actions": [
            {
                "openSearch": {
                    "endpoint": "https://my-endpoint",
                    "index": "my-index",
                    "type": "_doc",
                    "id": "${newuuid()}",
                    "roleArn": "arn:aws:iam::123456789012:role/aws_iot_os"
                }
            }
        ]
    }
}

The following JSON example defines an OpenSearch action with substitution templates in an AWS IoT rule.

{
    "topicRulePayload": {
        "sql": "SELECT * FROM 'some/topic'",
        "ruleDisabled": false,
        "awsIotSqlVersion": "2016-03-23",
        "actions": [
            {
                "openSearch": {
                    "endpoint": "https://my-endpoint",
                    "index": "${topic()}",
                    "type": "${type}",
                    "id": "${newuuid()}",
                    "roleArn": "arn:aws:iam::123456789012:role/aws_iot_os"
                }
            }
        ]
    }
}

Note

The the substituted type field works for OpenSearch version 1.0. For any versions later than 1.0, the value of type must be _doc.