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Troubleshoot Elasticsearch clusters

Use the topics in this section to troubleshoot Elasticsearch clusters.

Fix common cluster issues
Troubleshoot an unstable cluster
Troubleshoot an unbalanced cluster
Troubleshoot remote clusters
Diagnose unassigned shards
Troubleshoot shard capacity health issues
Using the cluster allocation API for troubleshooting

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Common cluster issues

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Welcome to the docs for the latest Elastic product versions, including Elastic Stack 9.0 and Elastic Cloud Serverless. To view previous versions, go to elastic.co/guide.