Free ElasticSearch Trivia Questions And Answers

Question 1

Every section is a .

Accepted Answer

inverted index

Answer

At its core, Elasticsearch relies on the concept of an inverted index for efficient full-text search. An inverted index maps terms to the documents in which they appear, rather than mapping documents to their terms. This structure allows for very fast lookup of documents containing specific words or phrases, making search operations highly performant.

Question 2

In the absence of a given ID, an ID will be produced automatically for the document.

Accepted Answer

Yes

Answer

When indexing a document into Elasticsearch, if you do not explicitly provide an `_id` for the document, Elasticsearch will automatically generate a unique ID. This auto-generated ID is a 20-character URL-safe string, ensuring that every document has a distinct identifier within its index. This feature simplifies document creation when unique identifiers are not readily available from the source data.

Question 3

An Index may be divided into several

Accepted Answer

Shards

Answer

An Elasticsearch index is a logical namespace that can be divided into multiple physical units called shards. Each shard is a self-contained Lucene index, capable of being hosted on any node in the cluster. Sharding allows an index to scale horizontally, distributing data and operations across multiple nodes, which improves performance and fault tolerance.

Question 4

Documents cannot be changed.

Accepted Answer

Yes

Answer

In Elasticsearch, documents are immutable. When you 'update' a document, Elasticsearch doesn't modify it in place. Instead, it marks the old document as deleted and then indexes a completely new version of the document with the updated content. This immutability simplifies concurrency control and ensures data integrity, although it means updates are effectively re-indexing operations.

Question 5

A shard may be a real or a replica.

Accepted Answer

Primary

Answer

In Elasticsearch, an index is composed of primary shards and replica shards. A primary shard is the original, authoritative copy of a portion of the index's data. Replica shards are exact copies of primary shards, providing redundancy for fault tolerance and increasing search throughput by distributing read requests.

ElasticSearch Practice Test

ElasticSearch Practice Test

Free ElasticSearch Trivia Questions And Answers