"Elastic-Cloud"
- Self-managed ELK → Elastic Cloud：5 年 ELK 集群的 lifecycle 收尾 Self-managed ELK Stack → Elastic Cloud 是 Type C operational redesign — protocol drop-in、operational stack（cluster sizing / shard 治理 / upgrade / backup）全託管；本文按 5 年 ELK lifecycle (build → scale → degrade → save → migrate) 組織、5 個 production 踩雷