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Why should wildcard queries avoid leading asterisks (*) in Elasticsearch?

hard🧠 Conceptual Q10 of 15
Elasticsearch - Basic Search Queries
Why should wildcard queries avoid leading asterisks (*) in Elasticsearch?
ALeading * is not supported syntax in Elasticsearch
BLeading * causes slow queries because it disables index optimizations
CLeading * matches only exact strings
DLeading * causes syntax errors
Step-by-Step Solution
Solution:

  1. Step 1: Understand impact of leading * in wildcard queries

    Leading * disables prefix optimizations, forcing Elasticsearch to scan many terms.

  2. Step 2: Confirm behavior and consequences

    This causes slow queries and high resource use, so it is discouraged.

  3. Final Answer:

    Leading * causes slow queries because it disables index optimizations -> Option B

  4. Quick Check:

    Leading * slows queries by disabling optimizations [OK]
Quick Trick: Avoid leading * in wildcard to keep queries fast [OK]
Common Mistakes:
MISTAKES
  • Thinking leading * is invalid syntax
  • Assuming leading * matches exact strings
  • Ignoring performance impact of leading *

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