ElasticSearch Technology & Digital Applications 2

Question 1

Which Elasticsearch feature allows you to search across multiple indices using a single query?

Accepted Answer

Multi-index search with wildcards

Answer

Elasticsearch supports multi-index search by specifying multiple index names or wildcard patterns (e.g., logs-*) in a single query.

Question 2

What does the 'refresh_interval' setting control in an Elasticsearch index?

Accepted Answer

How often new documents become searchable

Answer

The refresh_interval determines how often Elasticsearch refreshes the index, making newly indexed documents visible to searches.

Question 3

In Elasticsearch, what is the purpose of the '_source' field?

Accepted Answer

It contains the original JSON document as indexed

Answer

The _source field stores the original JSON body of a document, allowing retrieval of the full original document.

Question 4

Which Elasticsearch query type is best for full-text search on analyzed fields?

Accepted Answer

match query

Answer

The match query is the standard query for full-text search, applying the same analyzer used at index time to the search terms.

Question 5

What happens to a document when you update it in Elasticsearch?

Accepted Answer

A new version is created and the old one is marked for deletion

Answer

Elasticsearch documents are immutable; an update creates a new version of the document and marks the old version for deletion during segment merging.

ElasticSearch Practice Test