ElasticSearch ElasticSearch Indexing & Data Management

Question 1

What HTTP method is used to index a new document with a specific ID in Elasticsearch?

Accepted Answer

PUT

Answer

POST

Answer

PATCH

Answer

GET

Question 2

What is the Elasticsearch Bulk API used for?

Accepted Answer

Performing multiple index, update, or delete operations in a single request

Answer

Increasing shard count on an existing index

Answer

Running multiple queries at once

Answer

Reindexing large datasets across clusters

Question 3

What does 'reindexing' mean in Elasticsearch?

Accepted Answer

Copying documents from one index to another, often to apply new mappings or settings

Answer

Deleting and recreating an index with the same settings

Answer

Rebuilding the inverted index from raw data

Answer

Reassigning shards across nodes

Question 4

What is Index Lifecycle Management (ILM) in Elasticsearch?

Accepted Answer

A policy system to automate index transitions through phases like hot, warm, cold, and delete

Answer

A tool for backing up index data to S3

Answer

A method for distributing shards optimally

Answer

A monitoring tool for index performance

Question 5

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

Accepted Answer

Updates all documents that match a query using a script or partial update

Answer

Updates index mappings in bulk

Answer

Renames fields across all documents

Answer

Updates index settings without downtime

Question 6

What is a 'data stream' in Elasticsearch?

Accepted Answer

An abstraction over time-series indices that handles rollover and ILM automatically

Answer

A real-time CDC (change data capture) feed from a database

Answer

A Kafka-compatible message ingestion pipeline

Answer

A type of aggregation for streaming data