[Solved] You wrote this Elasticsearch query but all documents have _score equal to 1.0, which is unexpected: { "query": { "match_all": {} } } What is the likely reason for this behavior? | Elasticsearch

Elasticsearch - Search Results and Scoring

You wrote this Elasticsearch query but all documents have _score equal to 1.0, which is unexpected:

{
  "query": {
    "match_all": {}
  }
}

What is the likely reason for this behavior?

AThe <code>match_all</code> query assigns a constant <code>_score</code> of 1.0 to all documents

BThe index is empty so <code>_score</code> defaults to 1.0

CYou forgot to specify the field in the query

DThe <code>_score</code> is not returned by default

Step-by-Step Solution

Solution:

Step 1: Understand match_all query behavior
The match_all query matches every document equally and assigns a default _score of 1.0 to all.
Step 2: Check if this matches the observed behavior
Since all documents have _score 1.0, it confirms match_all is working as designed.
Final Answer:
The match_all query assigns a constant _score of 1.0 to all documents -> Option A
Quick Check:
match_all = constant _score 1.0 [OK]

Quick Trick: match_all always gives _score 1.0 [OK]

Common Mistakes:

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