[Solved] You wrote a query but all documents have a _score of 0. What is the most likely cause? - Ans: You used a filter clause instead of must | Elasticsearch

Elasticsearch - Search Results and Scoring

You wrote a query but all documents have a _score of 0. What is the most likely cause?

AYou used a <code>filter</code> clause instead of <code>must</code>

BYou forgot to specify the index

CYour documents are empty

DYou used a <code>match</code> query

Step-by-Step Solution

Solution:

Step 1: Understand filter vs must clauses
Filters do not calculate relevance scores; they only include/exclude documents, so _score is zero.
Step 2: Check other options
Forgetting index causes errors, empty docs don't affect score directly, and match queries produce scores.
Final Answer:
You used a filter clause instead of must -> Option A
Quick Check:
filter clause = _score zero [OK]

Quick Trick: Filters exclude scoring; use must for scoring queries [OK]

Common Mistakes:

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You wrote a query but all documents have a _score of 0. What is the most likely cause?