Elasticsearch - Document Operations
What will happen if you send a Bulk API request with two index actions having the same _id in the same batch?
What will happen if you send a Bulk API request with two index actions having the same _id in the same batch?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand duplicate _id behavior in Bulk API
When multiple index actions have the same _id, the last one overwrites previous ones.Step 2: Check Elasticsearch behavior
Elasticsearch does not throw an error but applies the last write for the same document ID.Final Answer:
The last index action will overwrite the previous one for that _id. -> Option DQuick Check:
Duplicate _id in bulk = last write wins [OK]
Quick Trick: Last index action with same _id overwrites earlier ones [OK]
Common Mistakes:
MISTAKES- Expecting conflict error on duplicate _id
- Thinking both documents are stored separately
- Assuming first action is kept
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