OpenSearch sink

You can use the opensearch sink plugin to send data to an OpenSearch cluster, a legacy Elasticsearch cluster, or an Amazon OpenSearch Service domain.

The plugin supports OpenSearch 1.0 and later and Elasticsearch 7.3 and later.

Usage

To configure an opensearch sink, specify the opensearch option within the pipeline configuration:

pipeline:
  ...
  sink:
    opensearch:
      hosts: ["https://localhost:9200"]
      cert: path/to/cert
      username: YOUR_USERNAME
      password: YOUR_PASSWORD
      index_type: trace-analytics-raw
      dlq_file: /your/local/dlq-file
      max_retries: 20
      bulk_size: 4

To configure an Amazon OpenSearch Service sink, specify the domain endpoint as the hosts option:

pipeline:
  ...
  sink:
    opensearch:
      hosts: ["https://your-amazon-opensearch-service-endpoint"]
      aws_sigv4: true
      cert: path/to/cert
      insecure: false
      index_type: trace-analytics-service-map
      bulk_size: 4

Configuration options

The following table describes options you can configure for the opensearch sink.

Configure max_retries

You can include the max_retries option in your pipeline configuration to control the number of times the source tries to write to sinks with exponential backoff. If you don’t include this option, pipelines keep retrying forever.

If you specify max_retries and a pipeline has a dead-letter queue (DLQ) configured, the pipeline will keep trying to write to sinks until it reaches the maximum number of retries, at which point it starts to send failed data to the DLQ.

If you don’t specify max_retries, only data that is rejected by sinks is written to the DLQ. Pipelines continue to try to write all other data to the sinks.

OpenSearch cluster security

In order to send data to an OpenSearch cluster using the opensearch sink plugin, you must specify your username and password within the pipeline configuration. The following example pipelines.yaml file demonstrates how to specify admin security credentials:

sink:
  - opensearch:
      username: "admin"
      password: "admin"
      ...

Alternately, rather than admin credentials, you can specify the credentials of a user mapped to a role with the minimum permissions listed in the following sections.

Cluster permissions

• cluster_all
• indices:admin/template/get
• indices:admin/template/put

Index permissions

• Index: otel-v1*; Index permission: indices_all
• Index: .opendistro-ism-config; Index permission: indices_all
• Index: *; Index permission: manage_aliases

For instructions on how to map users to roles, see Map users to roles.

Amazon OpenSearch Service domain security

The opensearch sink plugin can send data to an Amazon OpenSearch Service domain, which uses IAM for security. The plugin uses the default credential chain. Run aws configure using the AWS Command Line Interface (AWS CLI) to set your credentials.

Make sure the credentials that you configure have the required IAM permissions. The following domain access policy demonstrates the minimum required permissions:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::<AccountId>:user/data-prepper-user"
      },
      "Action": "es:ESHttp*",
      "Resource": [
        "arn:aws:es:us-east-1:<AccountId>:domain/<domain-name>/otel-v1*",
        "arn:aws:es:us-east-1:<AccountId>:domain/<domain-name>/_template/otel-v1*",
        "arn:aws:es:us-east-1:<AccountId>:domain/<domain-name>/_plugins/_ism/policies/raw-span-policy",
        "arn:aws:es:us-east-1:<AccountId>:domain/<domain-name>/_alias/otel-v1*",
        "arn:aws:es:us-east-1:<AccountId>:domain/<domain-name>/_alias/_bulk"
      ]
    },
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::<AccountId>:user/data-prepper-user"
      },
      "Action": "es:ESHttpGet",
      "Resource": "arn:aws:es:us-east-1:<AccountId>:domain/<domain-name>/_cluster/settings"
    }
  ]
}

For instructions on how to configure the domain access policy, see Resource-based policies in the Amazon OpenSearch Service documentation.

Fine-grained access control

If your OpenSearch Service domain uses fine-grained access control, the opensearch sink plugin requires some additional configuration.

IAM ARN as master user

If you’re using an IAM Amazon Resource Name (ARN) as the master user, include the aws_sigv4 option in your sink configuration:

...
sink:
    opensearch:
      hosts: ["https://your-fgac-amazon-opensearch-service-endpoint"]
      aws_sigv4: true

Run aws configure using the AWS CLI to use the master IAM user credentials. If you don’t want to use the master user, you can specify a different IAM role using the aws_sts_role_arn option. The plugin will then use this role to sign requests sent to the domain sink. The ARN that you specify must be included in the domain access policy.

Master user in the internal user database

If your domain uses a master user in the internal user database, specify the master username and password as well as the aws_sigv4 option:

sink:
    opensearch:
      hosts: ["https://your-fgac-amazon-opensearch-service-endpoint"]
      aws_sigv4: false
      username: "master-username"
      password: "master-password"

For more information, see Recommended configurations in the Amazon OpenSearch Service documentation.

Note: You can create a new IAM role or internal user database user with the all_access permission and use it instead of the master user.

OpenSearch Serverless collection security

The opensearch sink plugin can send data to an Amazon OpenSearch Serverless collection.

OpenSearch Serverless collection sinks have the following limitations:

• You can’t write to a collection that uses virtual private cloud (VPC) access. The collection must be accessible from public networks.
• The OTel trace group processor doesn’t currently support collection sinks.

Creating a pipeline role

First, create an IAM role that the pipeline will assume in order to write to the collection. The role must have the following minimum permissions:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "aoss:BatchGetCollection"
            ],
            "Resource": "*"
        }
    ]
}

The role must have the following trust relationship, which allows the pipeline to assume it:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::<AccountId>:root"
            },
            "Action": "sts:AssumeRole"
        }
    ]
}

Creating a collection

Next, create a collection with the following settings:

• Public network access to both the OpenSearch endpoint and OpenSearch Dashboards.

• The following data access policy, which grants the required permissions to the pipeline role:

  [
   {
      "Rules":[
         {
            "Resource":[
               "index/collection-name/*"
            ],
            "Permission":[
               "aoss:CreateIndex",
               "aoss:UpdateIndex",
               "aoss:DescribeIndex",
               "aoss:WriteDocument"
            ],
            "ResourceType":"index"
         }
      ],
      "Principal":[
         "arn:aws:iam::<AccountId>:role/PipelineRole"
      ],
      "Description":"Pipeline role access"
   }
   ]

  Important: Make sure to replace the ARN in the Principal element with the ARN of the pipeline role that you created in the preceding step.

  For instructions on how to create collections, see Creating collections in the Amazon OpenSearch Service documentation.

Creating a pipeline

Within your pipelines.yaml file, specify the OpenSearch Serverless collection endpoint as the hosts option. In addition, you must set the serverless option to true. Specify the pipeline role in the sts_role_arn option:

log-pipeline:
  source:
    http:
  processor:
    - date:
        from_time_received: true
        destination: "@timestamp"
  sink:
    - opensearch:
        hosts: [ "https://<serverless-public-collection-endpoint>" ]
        index: "my-serverless-index"
        aws:
          serverless: true
          sts_role_arn: "arn:aws:iam::<AccountId>:role/PipelineRole"
          region: "us-east-1"