Elasticsearch - Cluster Management
If an Elasticsearch cluster health API returns
{"status": "red"}, what is the most likely cause?If an Elasticsearch cluster health API returns {"status": "red"}, what is the most likely cause?
medium📝 Predict Output Q5 of Q15
Step-by-Step Solution
Solution:
Step 1: Interpret red status
Red means one or more primary shards are unassigned, causing data loss risk.Step 2: Differentiate from other statuses
Green means all shards active, yellow means replicas missing, red means primary shards missing.Final Answer:
Some primary shards are unassigned -> Option DQuick Check:
Red status = primary shards missing [OK]
Quick Trick: Red means primary shards missing, urgent fix needed [OK]
Common Mistakes:
MISTAKES- Confusing red with yellow
- Thinking red means cluster healthy
- Assuming only replicas missing
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