ElasticSearch ElasticSearch Indexing & Data Management 2

Question 1

What does the 'delete by query' API do in Elasticsearch?

Accepted Answer

Deletes all documents matching a specified query

Answer

Deletes an entire index matching a name pattern

Answer

Removes a field from all documents

Answer

Deletes unused index segments

Question 2

What is the purpose of the 'shrink' API in Elasticsearch?

Accepted Answer

Reducing the number of primary shards in an index

Answer

Compressing index data to save disk space

Answer

Merging all segments into one

Answer

Decreasing the replica count

Question 3

What is 'rollover' in the context of Elasticsearch index management?

Accepted Answer

Automatically creating a new index when the current one meets specified conditions like size or age

Answer

Restoring a snapshot to a new index

Answer

Rolling back failed index operations

Answer

Migrating an index to a different tier

Question 4

What is the Elasticsearch 'snapshot' feature used for?

Accepted Answer

Creating backups of indices or entire clusters to remote storage

Answer

Taking real-time screenshots of Kibana dashboards

Answer

Capturing the current cluster state for debugging

Answer

Freezing an index for read-only access

Question 5

What does 'field data' refer to in Elasticsearch?

Accepted Answer

An in-memory data structure used for sorting and aggregations on text fields

Answer

The raw bytes stored in a document field

Answer

The analyzer applied to a field

Answer

The number of documents containing a specific field

Question 6

What are 'doc values' in Elasticsearch?

Accepted Answer

An on-disk columnar data structure that supports sorting, aggregations, and scripting efficiently

Answer

The default value assigned to a field when it is missing

Answer

The total number of documents indexed per day

Answer

The stored source of a document