Amazon ElasticsearchおよびOpenSearchの古いバージョンはRDSと同様に延長サポート課金が発生する予定。11/07/2025から。これ7月じゃなくて11月だよね。
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Amazon OpenSearch Service announces Standard and Extended Support dates for Elasticsearch and OpenSearch versions | Amazon Web Services
https://aws.amazon.com/blogs/big-data/amazon-opensearch-service-announces-standard-and-extended-support-dates-for-elasticsearch-and-opensearch-versions/
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