ElasticSearch ElasticSearch 4

Question 1

What is the purpose of the `index.number_of_replicas` setting in Elasticsearch?

Accepted Answer

Sets the number of replica shards per primary shard for redundancy

Answer

The `index.number_of_replicas` setting defines how many replica copies exist for each primary shard, providing high availability and read scalability.

Question 2

Which Elasticsearch query would you use to search across multiple fields simultaneously?

Accepted Answer

multi_match query

Answer

The multi_match query extends the match query to run across multiple fields, with options for best_fields, most_fields, and cross_fields types.

Question 3

What does the `_score` field represent in an Elasticsearch search response?

Accepted Answer

A relevance score indicating how well the document matches the query

Answer

The `_score` field is a floating-point relevance score computed by Elasticsearch (using BM25 by default) indicating how well the document matches the query.

Question 4

What is the Elasticsearch Reindex API used for?

Accepted Answer

Copying documents from one index to another

Answer

The Reindex API copies documents from a source index to a destination index, allowing schema changes, data migration, or index consolidation.

Question 5

Which Elasticsearch feature allows you to define rules that automatically apply to new indices based on name patterns?

Accepted Answer

Index templates

Answer

Index templates allow you to define settings, mappings, and aliases that are automatically applied when a new index is created matching a specified pattern.

ElasticSearch Practice Test

ElasticSearch Practice Test

ElasticSearch ElasticSearch 4