Runtime fields in Elasticsearch - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a runtime field that calculates the length of the "message" field.

Elasticsearch

{
  "runtime_mappings": {
    "message_length": {
      "type": "long",
      "script": {
        "source": "emit(doc['message'].value.[1])"
      }
    }
  }
}

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Acount()

Bsize()

Clength()

Dlen()

Attempts:

3 left

💡 Hint

Common Mistakes

Using Python's len() function which is not valid in painless scripts.

Using size() which is for collections, not strings.

The length() method returns the length of a string in painless scripts used in runtime fields.

2fill in blank

medium

Complete the code to create a runtime field that extracts the first 3 characters of the "user" field.

Elasticsearch

{
  "runtime_mappings": {
    "user_prefix": {
      "type": "keyword",
      "script": {
        "source": "emit(doc['user'].value.[1](0, 3))"
      }
    }
  }
}

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Asubstr

Bsubstring

Cslice

Dcut

Attempts:

3 left

💡 Hint

Common Mistakes

Using substr which is not supported in painless.

Using slice which is a JavaScript method, not painless.

The substring method extracts a part of a string between two indices in painless scripts.

3fill in blank

hard

Fix the error in the runtime field script to correctly convert the "age" field to a string.

Elasticsearch

{
  "runtime_mappings": {
    "age_str": {
      "type": "keyword",
      "script": {
        "source": "emit(doc['age'].value.[1]())"
      }
    }
  }
}

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AtoString

Bstr

Cstringify

Dto_str

Attempts:

3 left

💡 Hint

Common Mistakes

Using Python's str() function which is invalid here.

Using stringify which is a JavaScript function, not painless.

The toString() method converts a number to its string representation in painless scripts.

4fill in blank

hard

Fill both blanks to create a runtime field that checks if the "status" field equals "active" and emits 1 if true, else 0.

Elasticsearch

{
  "runtime_mappings": {
    "is_active": {
      "type": "long",
      "script": {
        "source": "if (doc['status'].value [1] '[2]') { emit(1) } else { emit(0) }"
      }
    }
  }
}

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A==

B!=

Cactive

Dinactive

Attempts:

3 left

💡 Hint

Common Mistakes

Using != which checks inequality.

Using the wrong string like 'inactive'.

The equality operator == checks if the field value equals the string 'active'.

5fill in blank

hard

Fill all three blanks to create a runtime field that emits the uppercase version of the "city" field only if its length is greater than 5.

Elasticsearch

{
  "runtime_mappings": {
    "city_upper": {
      "type": "keyword",
      "script": {
        "source": "if (doc['city'].value.[1]() [2] 5) { emit(doc['city'].value.[3]()) }"
      }
    }
  }
}

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Alength

B>

CtoUpperCase

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using size() instead of length() for string length.

Using < instead of > for comparison.

Using toUpper instead of toUpperCase.

The length() method gets the string length, > compares it to 5, and toUpperCase() converts the string to uppercase.