Diagnose and Repair Elasticsearch Indices

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Diagnose and Repair Elasticsearch Indices

When configured correctly, Elasticsearch clusters are highly available and fault tolerant. That doesn't necessarily mean they are impervious to failure. Human error and hardware failure are always a possibility. Troubleshooting data availability issues on a distributed system can be a challenge. In this hands-on lab, we will use the cluster allocation explain API to demystify the troubleshooting process of shard allocation issues in Elasticsearch.

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Lab Info

Level

Intermediate

Last updated

Sep 19, 2025

Duration

1h 30m

Challenge

Troubleshoot any red-state indices.
Using the Secure Shell (SSH), log in to the data-1node ascloud_user` via the public IP address.

Start the elasticsearch node with:
```
sudo systemctl start elasticsearch
```
Use the Kibana console tool to execute the following:
```
PUT logs-02/_settings
{
  "number_of_replicas": 1
}
```
Challenge

Troubleshoot any yellow-state indices.
Use the Kibana console tool to execute the following:
```
PUT logs-01/_settings
{
  "number_of_replicas": 1
}
```

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