ElasticSearch ElasticSearch Core Concepts & Architecture 2

Question 1

What does 'inverted index' mean in Elasticsearch?

Accepted Answer

A data structure mapping terms to documents containing them

Answer

An index stored in reverse alphabetical order

Answer

An index that has been deleted and restored

Answer

A secondary index on a nested field

Question 2

What is the default number of primary shards when creating an index in Elasticsearch 7.x and later?

Accepted Answer

1

Answer

5

Answer

3

Answer

10

Question 3

What is a 'mapping' in Elasticsearch?

Accepted Answer

The schema definition for documents in an index

Answer

A visual diagram of cluster nodes

Answer

A routing algorithm for shards

Answer

A type of search query

Question 4

What does the 'near real-time' (NRT) property of Elasticsearch mean?

Accepted Answer

Data is available for search within about 1 second after indexing

Answer

Elasticsearch processes data in exactly real time

Answer

Queries are answered in under 1 millisecond

Answer

Replicas are always in sync with primary shards

Question 5

What is the purpose of the Elasticsearch '_id' field?

Accepted Answer

It uniquely identifies each document within an index

Answer

It stores the document's creation timestamp

Answer

It defines the routing shard for a document

Answer

It specifies the document's data type

Question 6

What does 'dynamic mapping' mean in Elasticsearch?

Accepted Answer

Elasticsearch automatically detects and maps new fields as documents are indexed

Answer

Mappings change based on query type

Answer

A mapping that only applies during indexing

Answer

Routing rules that change dynamically based on load