Free ElasticSearch Questions and Answers

Question 1

Elasticsearch is a what kind of database?

Accepted Answer

NoSQL

Answer

Elasticsearch is a distributed, RESTful search and analytics engine built on Apache Lucene. It is categorized as a NoSQL database, specifically a document-oriented database, because it stores data in schema-less JSON documents rather than structured tables with predefined schemas. This flexible data model allows for easy storage and retrieval of diverse data types, making it highly suitable for full-text search, log analysis, and real-time analytics.

Question 2

What is the bare minimum of master nodes that a cluster must have?

Accepted Answer

three

Answer

For a production Elasticsearch cluster, it is recommended to have a minimum of three dedicated master-eligible nodes. This configuration helps prevent split-brain scenarios, where different parts of the cluster disagree on the cluster state, by ensuring a quorum (majority) can always be formed. With three nodes, even if one fails, the remaining two can still form a quorum and maintain cluster stability and availability.

Question 3

An Elasticsearch cluster may have a variety of nodes, including the following:

Accepted Answer

Master, Data, Coordinating

Answer

Elasticsearch clusters are composed of different types of nodes, each with specific responsibilities. Master nodes manage the cluster state, data nodes store and index data, and coordinating nodes handle search requests and distribute them across data nodes. Other specialized node types like ingest nodes and machine learning nodes also exist, but Master, Data, and Coordinating are the fundamental categories.

Question 4

A tool called Kibana is used for:

Accepted Answer

Data visualization

Answer

Kibana is an open-source data visualization and exploration tool designed to work with Elasticsearch. It allows users to create interactive dashboards, charts, and graphs from data stored in Elasticsearch indices. Kibana is a crucial component of the Elastic Stack (ELK Stack), enabling users to analyze, visualize, and share insights from their data in real-time.

Question 5

Which Elastic Beat is employed for data transmission from files?

Accepted Answer

Filebeat

Answer

Filebeat is a lightweight shipper from the Elastic Beats family, specifically designed to forward log files and other file-based data to Elasticsearch or Logstash. It monitors specified directories for changes, collects new log entries, and sends them efficiently. This makes Filebeat ideal for collecting data from various applications and servers without consuming significant system resources.

ElasticSearch Practice Test

ElasticSearch Practice Test

Free ElasticSearch Questions and Answers