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OpenSearch 클러스터 운영자를 위한 인덱스 설계, 샤드/레플리카 전략, ISM 롤오버 라이프사이클, 모니터링·알림, 장애 대응, 보안 강화, 마이그레이션까지 실전 API 예제와 함께 총정리한다.
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