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

Elasticsearch - AWS IoT Core

Elasticsearch

The Elasticsearch (elasticsearch) 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.

Warning

The Elasticsearch action can only be used by existing rule actions. To create a new rule action or to update an existing rule action, use the OpenSearch rule action instead. For more information, see OpenSearch.

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 (KMS key) to encrypt data at rest in OpenSearch, 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:

Examples

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

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

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

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