[Solved] Why does this runtime field script cause an error?{"runtime_mappings": {"status": {"type": "keyword", "script": {"source": "emit(doc['status'].value.toUpperCase)"}}}} | Elasticsearch

Elasticsearch - Advanced Patterns

Why does this runtime field script cause an error?

{"runtime_mappings": {"status": {"type": "keyword", "script": {"source": "emit(doc['status'].value.toUpperCase)"}}}}

AField type keyword cannot use scripts

Bstatus field does not exist

Cemit cannot be used with strings

DtoUpperCase is missing parentheses

Step-by-Step Solution

Solution:

Step 1: Review method usage in script
toUpperCase is a method and requires parentheses to call it.
Step 2: Identify missing parentheses
Script uses toUpperCase without (), causing a syntax error.
Final Answer:
toUpperCase is missing parentheses -> Option D
Quick Check:
Method calls need parentheses = B [OK]

Quick Trick: Always add () when calling methods in scripts [OK]

Common Mistakes:

MISTAKES

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Why does this runtime field script cause an error?