Why is it important to re-enable shard allocation immediately after each node upgrade in a rolling upgrade?

hard🧠 Conceptual Q10 of Q15

Elasticsearch - Cluster Management

ATo allow the cluster to rebalance shards and maintain data redundancy

BTo prevent the cluster from shutting down automatically

CTo speed up the next node upgrade by preloading shards

DTo disable shard allocation permanently after upgrade

Step-by-Step Solution

Solution:

Step 1: Understand shard allocation role post-upgrade
Re-enabling allocation lets the cluster move shards to balance load and ensure replicas exist.
Step 2: Analyze consequences of not re-enabling
Without re-enabling, shards remain unbalanced, risking data loss and degraded performance.
Final Answer:
To allow the cluster to rebalance shards and maintain data redundancy -> Option A
Quick Check:
Re-enable allocation = shard rebalance and redundancy [OK]

Quick Trick: Re-enable allocation to keep cluster balanced and safe [OK]

Common Mistakes:

MISTAKES

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