Question 1

True or false: Elasticsearch uses Apache Lucene internally for indexing and searching data.

Accepted Answer

True. Elasticsearch is built on top of Lucene, which handles low-level indexing and search operations.

Question 2

True or false: Elasticsearch shards are automatically rebalanced across nodes when a node fails.

Accepted Answer

True. Elasticsearch's cluster management automatically redistributes shards to healthy nodes after a failure.

Question 3

True or false: Elasticsearch allows you to define custom analyzers that combine tokenizers and filters for text processing.

Accepted Answer

True. Custom analyzers let you control how text is tokenized and filtered, enabling language-specific or domain-specific search.

Question 4

True or false: Elasticsearch can only be queried using its own JSON-based Query DSL.

Accepted Answer

False. Elasticsearch also supports SQL queries via Elasticsearch SQL, and other interfaces like EQL and Painless scripts.

Question 5

True or false: You can use Elasticsearch as a primary database for ACID-compliant transactions.

Accepted Answer

False. Elasticsearch is not ACID-compliant; it's optimized for search and analytics, not transactional integrity.

Question 6

True or false: Elasticsearch indexes data in real-time, meaning a document is searchable instantly after indexing.

Accepted Answer

False. Indexed documents become searchable only after a refresh interval (default 1 second), not instantly.

Question 7

True or false: Elasticsearch maps fields dynamically by default, but this can lead to index mapping explosions.

Accepted Answer

False. While dynamic mapping is default, mapping explosions are typically caused by too many unique field names, not dynamic mapping itself.

Question 8

True or false: Elasticsearch was originally created as a search engine for recipe websites.

Accepted Answer

True. Shay Banon built the first version of Elasticsearch to help his wife find recipes more easily.

Elasticsearch Trivia Questions