ElasticSearch ElasticSearch Core Concepts & Architecture

Question 1

What is the basic unit of storage in Elasticsearch?

Accepted Answer

Document

Answer

Index

Answer

Shard

Answer

Node

Question 2

What does an Elasticsearch cluster consist of?

Accepted Answer

One or more nodes that share data and workload

Answer

Only one master node

Answer

Only data nodes

Answer

A single index with multiple shards

Question 3

What is a shard in Elasticsearch?

Accepted Answer

A single Lucene instance that holds a subset of index data

Answer

A type of query

Answer

A backup copy of an index

Answer

A node configuration file

Question 4

What role does the master node play in an Elasticsearch cluster?

Accepted Answer

Manages cluster-wide settings and metadata

Answer

Handles all search queries

Answer

Stores all primary shards

Answer

Provides the REST API endpoint

Question 5

What is a replica shard in Elasticsearch?

Accepted Answer

A secondary copy of a primary shard for redundancy and read scaling

Answer

A shard on the master node

Answer

A temporary shard used during reindexing

Answer

A shard used only for aggregations

Question 6

Which API is used to check the health of an Elasticsearch cluster?

Accepted Answer

GET /_cluster/health

Answer

GET /_nodes

Answer

GET /_status

Answer

GET /_stats