Elasticsearch - Basics and Architecture
Why does Elasticsearch use an inverted index instead of a forward index for text search?
Why does Elasticsearch use an inverted index instead of a forward index for text search?
hard🧠 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Compare inverted and forward indexes
Forward index maps documents to terms; inverted index maps terms to documents.Step 2: Identify why inverted index is preferred for search
Inverted index allows quick finding of all documents containing a term, speeding search.Final Answer:
Because inverted index allows fast lookup of documents by terms -> Option CQuick Check:
Inverted index = fast term to document search [OK]
Quick Trick: Inverted index speeds term-based document search [OK]
Common Mistakes:
MISTAKES- Confusing inverted with forward index purpose
- Thinking inverted index stores full documents
- Assuming forward index is only for numbers
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