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

The delete by query API deletes all documents in an index that match a given query, operating on a snapshot of the data at query time.

Question 2

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

Accepted Answer

Reducing the number of primary shards in an index

Answer

The shrink API allows you to reduce the number of primary shards in an index, which is useful after data becomes less active and fewer shards are needed.

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

Rollover creates a new write index when the current index meets specified conditions such as maximum document count, index size, or age.

Question 4

What is the Elasticsearch 'snapshot' feature used for?

Accepted Answer

Creating backups of indices or entire clusters to remote storage

Answer

The snapshot API creates backups of individual indices or entire clusters to a remote repository such as S3, GCS, or a shared filesystem.

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

Field data is an in-memory data structure Elasticsearch builds on demand to support sorting and aggregations on analyzed text fields, though it can be memory-intensive.

ElasticSearch Practice Test

ElasticSearch Practice Test

ElasticSearch ElasticSearch Indexing & Data Management 2