What should I check first when Elasticsearch fails?

Question

A failure needs to be narrowed down before settings are changed or operations retried. Which evidence best separates application errors from environment and dependency problems?

Tasadduq Burney · Accepted Answer

Check cluster health, shard allocation explanations, disk watermarks and rejected requests. Identify whether the issue is indexing, searching or unavailable shards. A yellow cluster and a red cluster indicate different availability conditions, so read the affected shard state before taking corrective action.

What should I check first when Elasticsearch fails?

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