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You want to create a runtime field status that returns "adult" if age ≥ 18, otherwise "minor". Which painless script correctly implements this logic?

hard🚀 Application Q15 of Q15

Elasticsearch - Advanced Patterns

You want to create a runtime field status that returns "adult" if age ≥ 18, otherwise "minor". Which painless script correctly implements this logic?

A"emit(doc['age'].value >= 18 ? 'adult' : 'minor')"

B"if (doc['age'].value >= 18) { return 'adult' } else { return 'minor' }"

C"emit(doc['age'] >= 18 ? 'adult' : 'minor')"

D"emit(doc['age'].value > 18 ? 'adult' : 'minor')"

Step-by-Step Solution

Solution:

Step 1: Check correct painless syntax for runtime fields
Runtime fields use emit() to output values; accessing field value requires doc['age'].value.
Step 2: Verify conditional logic
"emit(doc['age'].value >= 18 ? 'adult' : 'minor')" uses ternary operator with >= 18 and emits 'adult' or 'minor' correctly.
Final Answer:
"emit(doc['age'].value >= 18 ? 'adult' : 'minor')" -> Option A
Quick Check:
emit() + ternary + doc['age'].value = correct [OK]

Quick Trick: Use emit() with ternary and doc['field'].value for conditions [OK]

Common Mistakes:

MISTAKES

Using return instead of emit() in runtime fields
Accessing doc['age'] without .value
Using > instead of >= changing logic

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