[Solved] Given this Elasticsearch query snippet, what fields will be returned in the search results? { "_source": { "includes": ["title", "author"] }, "query": { "match_all": {} } } | Elasticsearch

Elasticsearch - Search Results and Scoring

Given this Elasticsearch query snippet, what fields will be returned in the search results?

{
  "_source": { "includes": ["title", "author"] },
  "query": { "match_all": {} }
}

AAll fields will be returned

BAll fields except <code>title</code> and <code>author</code> will be returned

CNo fields will be returned

DOnly the fields <code>title</code> and <code>author</code> will be returned

Step-by-Step Solution

Solution:

Step 1: Understand includes in _source
The includes key specifies which fields to return from the document.
Step 2: Apply to given query
Since only title and author are included, only these fields will appear in the results.
Final Answer:
Only the fields title and author will be returned -> Option D
Quick Check:
includes fields = return only those fields [OK]

Quick Trick: includes means return only listed fields [OK]

Common Mistakes:

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