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Given this update request:

medium📝 Predict Output Q4 of 15
Elasticsearch - Document Operations
Given this update request:
POST /myindex/_update/42?version=5
{"doc":{"name":"Alice"}}

If the current document version is 4, what will happen?
AThe update will succeed and version will become 6
BThe update will fail due to version conflict
CThe update will succeed but version remains 5
DThe update will be ignored silently
Step-by-Step Solution
Solution:
  1. Step 1: Understand version check on update

    Elasticsearch requires the version in request to match current document version.
  2. Step 2: Compare current version 4 with request version 5

    Since 5 != 4, Elasticsearch rejects update with version conflict error.
  3. Final Answer:

    The update will fail due to version conflict -> Option B
  4. Quick Check:

    Version mismatch causes conflict error [OK]
Quick Trick: Update version must match current document version [OK]
Common Mistakes:
MISTAKES
  • Assuming update auto-corrects version
  • Thinking update silently ignores version mismatch
  • Believing version increments automatically on conflict

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