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What does the _update API in Elasticsearch do?

easy🧠 Conceptual Q11 of 15
Elasticsearch - Document Operations
What does the _update API in Elasticsearch do?
AIt retrieves a document by its ID.
BIt modifies specific fields of an existing document without replacing the whole document.
CIt creates a new index with updated settings.
DIt deletes the entire document from the index.
Step-by-Step Solution
Solution:

  1. Step 1: Understand the purpose of _update API

    The _update API is designed to change parts of a document without replacing the entire document.

  2. Step 2: Compare options with the API function

    Only It modifies specific fields of an existing document without replacing the whole document. correctly describes modifying specific fields without full replacement, while others describe unrelated actions.

  3. Final Answer:

    It modifies specific fields of an existing document without replacing the whole document. -> Option B

  4. Quick Check:

    _update API modifies parts of a document [OK]
Quick Trick: Remember _update changes parts, not whole documents [OK]
Common Mistakes:
MISTAKES
  • Thinking _update deletes documents
  • Confusing _update with document retrieval
  • Assuming _update creates new indexes

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