Migrate Elastcsearch data to OpenSearch is outdated

[anelook]

What's wrong?

The article that describes how to move data from Elasticsearch to OpenSearch https://developer.aiven.io/docs/products/opensearch/howto/migrating_elasticsearch_data_to_aiven.html is outdated. It assumes that a customer moves from Aiven for Elasticsearch, however all our customers already did the migration. The content should be updated with information how to migrate from an external Elastisearch service to Aiven (using reIndex API)

URL of affected page, and any other information