You want to optimize cache clearing by only clearing fielddata cache for fields starting with user_. Which approach is correct?

hard🚀 Application Q9 of Q15

Elasticsearch - Performance and Scaling

You want to optimize cache clearing by only clearing fielddata cache for fields starting with user_. Which approach is correct?

AUse <code>POST /index/_cache/clear</code> with <code>{ "fielddata": { "fields": ["user_*"] } }</code>

BUse <code>POST /index/_cache/clear</code> with <code>{ "fielddata": true }</code> and rely on automatic filtering

CUse <code>POST /index/_cache/clear</code> with <code>{ "query": true }</code> and filter fields in query

DFielddata cache cannot be cleared selectively by field patterns

Step-by-Step Solution

Solution:

Step 1: Understand selective fielddata cache clearing
Elasticsearch allows clearing fielddata cache selectively by specifying fields in the JSON body.
Step 2: Verify correct JSON syntax
Using { "fielddata": { "fields": ["user_*"] } } clears fielddata cache only for fields matching the pattern.
Final Answer:
Use POST /index/_cache/clear with { "fielddata": { "fields": ["user_*"] } } -> Option A
Quick Check:
Fielddata cache can be cleared selectively by fields [OK]

Quick Trick: Specify fields array in fielddata cache clear JSON to target fields [OK]

Common Mistakes:

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