[Solved] You wrote this highlight section but no highlights appear:"highlight": {"fields": {"summary": {"type": "plain"}}}What is a likely cause? | Elasticsearch

Elasticsearch - Search Results and Scoring

You wrote this highlight section but no highlights appear:

"highlight": {"fields": {"summary": {"type": "plain"}}}

What is a likely cause?

AHighlighting only works on numeric fields.

BThe highlight type plain is invalid and causes failure.

CYou must specify pre_tags and post_tags for highlights to work.

DThe field summary is not stored or indexed for highlighting.

Step-by-Step Solution

Solution:

Step 1: Check field indexing and storage
Highlighting requires the field to be stored or indexed with term vectors.
Step 2: Evaluate other options
Type plain is valid, tags are optional, and highlighting does not work on numeric fields.
Final Answer:
The field summary is not stored or indexed for highlighting. -> Option D
Quick Check:
Highlight needs stored/indexed text field [OK]

Quick Trick: Ensure field is stored/indexed for highlighting [OK]

Common Mistakes:

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