[Solved] You wrote this runtime field script:{ "runtime_mappings": { "discounted_price": { "type": "double", "script": { "source": "emit(doc['price'].value * 0.9)" } } } }But the query fails with an error:... | Elasticsearch

Elasticsearch - Advanced Patterns

You wrote this runtime field script:

{
  "runtime_mappings": {
    "discounted_price": {
      "type": "double",
      "script": {
        "source": "emit(doc['price'].value * 0.9)"
      }
    }
  }
}

But the query fails with an error: Field [price] not found in doc. What is the likely cause?

ARuntime fields cannot use numeric types

BThe script syntax is incorrect

CThe <code>price</code> field is missing in some documents

DThe <code>discounted_price</code> field must be defined in mappings

Step-by-Step Solution

Solution:

Step 1: Analyze error message
Error says price field not found in document, meaning some docs lack this field.
Step 2: Understand runtime field behavior
Runtime scripts fail if they access missing fields without checks.
Final Answer:
The price field is missing in some documents -> Option C
Quick Check:
Missing field in doc causes runtime script error [OK]

Quick Trick: Check if all docs have fields used in runtime scripts [OK]

Common Mistakes:

MISTAKES

Assuming script syntax error without checking data
Thinking runtime fields require mapping changes
Ignoring missing field presence in documents

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You wrote this runtime field script:

Step 1: Analyze error message

Step 2: Understand runtime field behavior

Final Answer:

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