Which of the following is the correct way to define a date field with a custom format in an Elasticsearch mapping?

easy📝 Syntax Q12 of 15

Elasticsearch - Mappings and Data Types

A{ "mappings": { "properties": { "created_at": {"type": "integer", "format": "yyyy-MM-dd"} } } }

B{ "mappings": { "properties": { "created_at": {"type": "date", "format": "yyyy-MM-dd HH:mm:ss"} } } }

C{ "mappings": { "properties": { "created_at": {"type": "date"} } } }

D{ "mappings": { "properties": { "created_at": {"type": "text", "format": "yyyy-MM-dd"} } } }

Step-by-Step Solution

Solution:

Step 1: Check the field type for date
The field must have type set to date to store dates.
Step 2: Verify the format property
Custom date formats are specified with the format key inside the date field definition.
Final Answer:
Mapping with type 'date' and format 'yyyy-MM-dd HH:mm:ss' -> Option B
Quick Check:
Date type + format key = correct mapping [OK]

Quick Trick: Date fields need type 'date' and format string [OK]

Common Mistakes:

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