[Solved] You have this mapping: { "properties": { "username": { "type": "keyword" }, "bio": { "type": "text" } } } A developer tries to filter users with username containing "john" using this query:... | Elasticsearch

Elasticsearch - Mappings and Data Types

You have this mapping:

{
  "properties": {
    "username": { "type": "keyword" },
    "bio": { "type": "text" }
  }
}

A developer tries to filter users with username containing "john" using this query:

{ "match": { "username": "john" } }

Why does this query not work as expected?

ABecause match query only works on numeric fields

BBecause username field should be of type text for exact matches

CBecause match query does not work on keyword fields for partial matches

DBecause bio field should be used instead of username

Step-by-Step Solution

Solution:

Step 1: Understand keyword field behavior
Keyword fields are not analyzed and do not support partial matching with match query.
Step 2: Understand match query limitations
Match query analyzes input and is meant for text fields, not keyword fields which require term or wildcard queries for partial matches.
Final Answer:
Because match query does not work on keyword fields for partial matches -> Option C
Quick Check:
Match query + keyword field = no partial match [OK]

Quick Trick: Match query needs text fields, not keyword [OK]

Common Mistakes:

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