ElasticSearch Research & Evidence-Based Practice 3

Question 1

A research platform needs to implement peer review scoring where each reviewer scores a paper from 1-10. Which Elasticsearch aggregation computes the average score across all reviews for a paper?

Accepted Answer

avg aggregation

Answer

The avg aggregation computes the arithmetic mean of numeric field values across matching documents, making it ideal for average review scores.

Question 2

An evidence repository indexes documents from multiple languages. Researchers need to search English and Spanish content simultaneously using language-specific analyzers. Which mapping approach supports this?

Accepted Answer

Use multi-fields with language-specific analyzers per language variant

Answer

Multi-fields allow the same content to be analyzed multiple ways, enabling language-specific subfields (e.g., content.en, content.es) with appropriate analyzers.

Question 3

A researcher uses Elasticsearch to power a citation graph. They need to find all documents that cite a specific paper (paper ID = 'A123'). Which query should they use?

Accepted Answer

term query on citations field with value 'A123'

Answer

The term query performs an exact, keyword-level match without analysis, which is correct for matching a precise document ID in a citations array.

Question 4

Research data indexed with a daily date_histogram shows sparse days with zero publications. Which date_histogram parameter ensures empty buckets are included in the response?

Accepted Answer

min_doc_count: 0 with extended_bounds

Answer

Setting min_doc_count: 0 combined with extended_bounds forces Elasticsearch to return buckets even when no documents fall in that interval.

Question 5

A scientific search engine needs to suggest corrections for misspelled medical terms (e.g., 'diabetis' → 'diabetes'). Which Elasticsearch feature handles this?

Accepted Answer

term suggester

Answer

The term suggester uses edit distance to propose corrections for individual misspelled words, making it suitable for fixing typos in search queries.

ElasticSearch Practice Test

ElasticSearch Practice Test

ElasticSearch Research & Evidence-Based Practice 3