[Solved] Given the following sequence during a rolling upgrade:1. Disable shard allocation2. Upgrade node 13. Upgrade node 24. Enable shard allocationWhat is the expected cluster behavior after step 4? | Elasticsearch

Elasticsearch - Cluster Management

Given the following sequence during a rolling upgrade:

1. Disable shard allocation
2. Upgrade node 1
3. Upgrade node 2
4. Enable shard allocation

What is the expected cluster behavior after step 4?

AThe cluster will stop accepting new data

BThe cluster will rebalance shards across all nodes

CThe cluster will delete old shards permanently

DThe cluster will remain unbalanced with shards stuck

Step-by-Step Solution

Solution:

Step 1: Understand shard allocation states
Disabling shard allocation prevents shard movement during upgrade; enabling it allows rebalancing.
Step 2: Analyze cluster behavior after enabling allocation
After enabling, the cluster redistributes shards to balance load.
Final Answer:
The cluster will rebalance shards across all nodes -> Option B
Quick Check:
Enable allocation = rebalance shards [OK]

Quick Trick: Enabling shard allocation triggers shard rebalancing [OK]

Common Mistakes:

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