Elasticsearch without masters, or how to revive a corpse

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Summary

This article explains how to recover an Elasticsearch cluster when master nodes fail and the cluster cannot form a quorum. It walks through a bare-metal and AWS-oriented setup and shows how to use Elasticsearch recovery tools such as unsafe bootstrap and dangling index recovery. The author also describes how to restore metadata and node data paths when cluster state is lost. The final section provides commands for detecting and reattaching dangling indices after recovery.

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