You want to increase the 'stock' field by 10 in a product document with ID '10' using a partial update. Which request body correctly achieves this?

hard🚀 Application Q15 of 15

Elasticsearch - Document Operations

A{ "update": { "stock": 10 } }

B{ "doc": { "stock": 10 } }

C{ "doc": { "stock": "stock + 10" } }

D{ "script": { "source": "ctx._source.stock += params.count", "params": { "count": 10 } } }

Step-by-Step Solution

Solution:

Step 1: Understand increment operation in partial update
To increase a numeric field, use a script that adds the value to the existing field.
Step 2: Identify correct syntax for scripted update
{ "script": { "source": "ctx._source.stock += params.count", "params": { "count": 10 } } } uses the 'script' key with source code to add 10 to 'stock'.
Final Answer:
{ "script": { "source": "ctx._source.stock += params.count", "params": { "count": 10 } } } -> Option D
Quick Check:
Use script to increment numeric fields [OK]

Quick Trick: Use script with ctx._source to increment fields [OK]

Common Mistakes:

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