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What is the default format used by Elasticsearch for date fields if no format is specified?

easy🧠 Conceptual Q1 of 15
Elasticsearch - Mappings and Data Types
What is the default format used by Elasticsearch for date fields if no format is specified?
AEpoch milliseconds
BStrict date optional time format (ISO 8601)
CUnix timestamp in seconds
DCustom user-defined format
Step-by-Step Solution
Solution:

  1. Step 1: Understand Elasticsearch default date format

    Elasticsearch uses ISO 8601 format by default for date fields if no format is specified.

  2. Step 2: Compare options with default

    Among the options, only "Strict date optional time format (ISO 8601)" matches the default format.

  3. Final Answer:

    Strict date optional time format (ISO 8601) -> Option B

  4. Quick Check:

    Date default format = ISO 8601 [OK]
Quick Trick: Default date format is ISO 8601 unless specified otherwise [OK]
Common Mistakes:
MISTAKES
  • Confusing epoch milliseconds as default
  • Assuming Unix timestamp is default
  • Thinking custom format is default

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