ElasticSearch Trivia 3

Question 1

What is the maximum recommended number of shards per gigabyte of JVM heap in Elasticsearch?

Accepted Answer

20

Answer

Elasticsearch recommends keeping fewer than 20 shards per GB of heap memory to maintain cluster stability.

Question 2

Which Elasticsearch feature allows you to automatically move data to cheaper storage tiers as it ages?

Accepted Answer

ILM (Index Lifecycle Management)

Answer

Index Lifecycle Management (ILM) automates the transition of indices through hot, warm, cold, and frozen tiers based on age or size.

Question 3

What does the '_source' field store in an Elasticsearch document?

Accepted Answer

The original JSON document as ingested

Answer

The '_source' field stores the original JSON body of the document exactly as it was indexed.

Question 4

Which Elasticsearch API is used to perform multiple index/delete/update operations in a single request?

Accepted Answer

Bulk API

Answer

The Bulk API allows sending multiple create, index, update, and delete actions in a single HTTP request for better throughput.

Question 5

What is the role of a 'coordinating node' in an Elasticsearch cluster?

Accepted Answer

Routes requests and merges results

Answer

A coordinating node receives client requests, routes them to the appropriate data nodes, and aggregates the results before responding.

ElasticSearch Practice Test