ElasticSearch ElasticSearch Search & Query DSL 3

Question 1

What is a 'range' query in Elasticsearch?

Accepted Answer

A query that finds documents where a field value falls within a specified range

Answer

A range query finds documents where a field's value falls within a specified range using operators like gte, lte, gt, and lt.

Question 2

What is the purpose of 'aggregations' in Elasticsearch?

Accepted Answer

To summarize and analyze data, similar to SQL GROUP BY

Answer

Aggregations allow you to group and summarize data in various ways (metrics, buckets, pipeline), similar to GROUP BY with aggregate functions in SQL.

Question 3

What does a 'terms' aggregation return in Elasticsearch?

Accepted Answer

The top unique values of a field with their document counts

Answer

A terms aggregation dynamically builds a bucket for each unique value of a field, returning the most frequent values and their document counts.

Question 4

What is the Elasticsearch 'scroll' API used for?

Accepted Answer

Efficiently retrieving large numbers of results by maintaining a search context

Answer

The scroll API allows retrieval of large numbers of results by maintaining a search context on the server, enabling batched retrieval without deep pagination penalties.

Question 5

What is a 'multi_match' query in Elasticsearch?

Accepted Answer

A query that runs the same match query across multiple fields

Answer

A multi_match query extends the match query to allow searching across multiple fields simultaneously with configurable tie-breaking strategies.

ElasticSearch Practice Test

ElasticSearch Practice Test

ElasticSearch ElasticSearch Search & Query DSL 3