ElasticSearch ElasticSearch Core Concepts & Architecture

Question 1

What is the basic unit of storage in Elasticsearch?

Accepted Answer

Document

Answer

A document is the basic unit of information stored in Elasticsearch, represented as a JSON object.

Question 2

What does an Elasticsearch cluster consist of?

Accepted Answer

One or more nodes that share data and workload

Answer

An Elasticsearch cluster consists of one or more nodes that together hold all the data and provide federated indexing and search capabilities.

Question 3

What is a shard in Elasticsearch?

Accepted Answer

A single Lucene instance that holds a subset of index data

Answer

A shard is a single Lucene instance that holds a portion of an index's data, enabling horizontal scaling.

Question 4

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

Accepted Answer

Manages cluster-wide settings and metadata

Answer

The master node is responsible for cluster-wide operations such as creating/deleting indices and tracking which nodes are part of the cluster.

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 replica shard is a copy of a primary shard that provides fault tolerance and can serve read requests to improve throughput.

ElasticSearch Practice Test