Elastic Search Node deleted

We had an unfortunate incident that one of the node (ubuntu server) has corrupted and couldn't recover the data on the node. We also had single shards with no replicas. Now the Cluster is still in Red color. What would the right approach to get the cluster back to normal. Its a cluster with 3 data nodes and 2 master nodes. Please let me know. Thanks !

Unless you have snapshots to restore you have lost the data that were on the failed node, which is the risk you take when running without replicas. You can however use the cluster reroute API with the allocate_empty_primary to force new empty primary shards to be allocated instead of the ones that are missing.

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