Migrating data from Elasticsearch to Yandex Managed Service for OpenSearch

You can set up data transfer from Elasticsearch to Managed Service for OpenSearch indexes using Data Transfer. To do this:

1. Set up the source cluster.
2. Prepare the test data.
3. Configure the target cluster.
4. Prepare and activate the transfer.
5. Test the transfer.

If you no longer need the resources you created, delete them.

Getting startedGetting started

1. Prepare the infrastructure:

   1. Create a custom Elasticsearch installation.

   2. Enable access to the cluster from Yandex Cloud.

   3. Create a Managed Service for OpenSearch target cluster in any suitable configuration with publicly available hosts.

2. Install the utilities:

   • curl to make requests to clusters.

     sudo apt update && sudo apt install --yes curl
     

   • jq for JSON file stream processing.

     sudo apt update && sudo apt install --yes jq
     

Set up the source clusterSet up the source cluster

1. (Optional) Create a user to execute the transfer.

   You can provide data from the Elasticsearch cluster as the admin user with the superuser role; however, it is more secure to create separate users with limited privileges for each task.

   1. In the source cluster, create a role with the create_index and write privileges for all indexes (*).

   2. In the source cluster, create a user to execute the transfer and assign the user the role you created.

Prepare the test dataPrepare the test data

1. In the source cluster, create a test index named people and set its schema:

   curl --user <username_in_source_cluster>:<user_password_in_source_cluster> \
        --cacert ~/.elasticsearch/root.crt \
        --header 'Content-Type: application/json' \
        --request PUT 'https://<address_of_Elasticsearch_host_with_Data_Node_role>:9200/people' && \
   curl --user <username_in_source_cluster>:<user_password_in_source_cluster> \
        --cacert ~/.elasticsearch/root.crt \
        --header 'Content-Type: application/json' \
        --request PUT 'https://<address_of_Elasticsearch_host_with_Data_Node_role>:9200/people/_mapping?pretty' \
        --data'
        {
              "properties": {
                 "name": {"type": "text"},
                 "age": {"type": "integer"}
              }
        }
        '
   

2. Populate the test index with data:

   curl --user <username_in_source_cluster>:<user_password_in_source_cluster> \
        --cacert ~/.elasticsearch/root.crt \
        --header 'Content-Type: application/json' \
        --request POST 'https://<address_of_Elasticsearch_host_with_Data_Node_role>:9200/people/_doc/?pretty' \
        --data'
        {
              "name" : "Alice",
              "age" : "30"
        }
        ' && \
   curl --user <username_in_source_cluster>:<user_password_in_source_cluster> \
        --cacert ~/.elasticsearch/root.crt \
        --header 'Content-Type: application/json' \
        --request POST 'https://<address_of_Elasticsearch_host_with_Data_Node_role>:9200/people/_doc/?pretty' \
        --data'
        {
              "name" : "Robert",
              "age" : "32"
        }
        '
   

3. (Optional) Check the data in the test index:

   curl --user <username_in_target_cluster>:<user_password_in_target_cluster> \
        --cacert ~/.elasticsearch/root.crt \
        --header 'Content-Type: application/json' \
        --request GET 'https://<address_of_Elasticsearch_host_with_Data_Node_role>:9200/people/_search?pretty'
   

Configure the target clusterConfigure the target cluster

1. Get an SSL certificate to connect to the Managed Service for OpenSearch cluster.

2. (Optional) Create a user to execute the transfer.

   You can provide data to the Managed Service for OpenSearch cluster as the admin user with the superuser role; however, it is more secure to create separate users with limited privileges for each task.

   1. Create a role with the create_index and write privileges for all indexes (*).

   2. Create a user and assign this role to them.

Prepare and activate the transferPrepare and activate the transfer

1. Create an endpoint for the Elasticsearch source.

2. Create an endpoint for the OpenSearch target.

3. Create a transfer:

   Manually

   Terraform

   1. Create a transfer of the Snapshot type that will use the created endpoints.
   2. Activate the transfer and wait for its status to change to Completed.

   1. In the data-transfer-mes-mos.tf file, specify these variables:

      • source_endpoint_id: ID of the source endpoint.
      • target_endpoint_id: Target endpoint ID.
      • transfer_enabled: 1 to create a transfer.

   2. Check that the Terraform configuration files are correct using this command:

      terraform validate
      

      If there are any errors in the configuration files, Terraform will point them out.

   3. Create the required infrastructure:

      1. Run the command to view planned changes:

         terraform plan
         

         If the resource configuration descriptions are correct, the terminal will display a list of the resources to modify and their parameters. This is a test step. No resources are updated.

      2. If you are happy with the planned changes, apply them:

         1. Run the command:

            terraform apply
            

         2. Confirm the update of resources.

         3. Wait for the operation to complete.

   4. Activate the transfer and wait for its status to change to Completed.

Test the transferTest the transfer

Check that the Managed Service for OpenSearch cluster's people index contains the data that was sent:

curl --user <username_in_target_cluster>:<user_password_in_target_cluster> \
     --cacert ~/.opensearch/root.crt \
     --header 'Content-Type: application/json' \
     --request GET 'https://<address_of_OpenSearch_host_with_Data_Node_role>:9200/people/_search?pretty'

Delete the resources you createdDelete the resources you created

Some resources are not free of charge. To avoid paying for them, delete the resources you no longer need:

1. Delete the transfer.

2. Delete endpoints for both the source and target.

3. Delete the Managed Service for OpenSearch cluster.

4. Delete the subnet and network.