ElasticSearch ElasticSearch Indexing & Data Management 1

Question 1

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

Accepted Answer

PUT

Answer

The PUT method is used to index a document with a specific ID: PUT /index_name/_doc/document_id.

Question 2

What is the Elasticsearch Bulk API used for?

Accepted Answer

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

Answer

The Bulk API allows you to perform multiple index, create, update, or delete operations in a single HTTP request, significantly improving throughput.

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

Reindexing is the process of copying documents from a source index to a destination index, typically used when you need to change mappings or index settings.

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

ILM automates the management of indices over time by defining policies that move indices through lifecycle phases (hot, warm, cold, frozen, delete) based on criteria like age or size.

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

The update by query API performs updates on all documents matching a given query, often using a Painless script to modify field values.

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ElasticSearch ElasticSearch Indexing & Data Management 1