ElasticSearch ElasticSearch 5

Question 1

What is the purpose of the `fielddata` setting for text fields in Elasticsearch?

Accepted Answer

Allows text fields to be used in sorting and aggregations by loading data into heap memory

Answer

fielddata loads analyzed text field values into the JVM heap to enable sorting and aggregations on text fields, but it is memory-intensive and disabled by default.

Question 2

Which Elasticsearch API allows you to execute multiple search requests in a single HTTP request?

Accepted Answer

Multi Search (msearch) API

Answer

The Multi Search API (msearch) allows you to bundle multiple search requests in a single HTTP call, reducing round-trip overhead.

Question 3

What does a 'split brain' problem mean in the context of an Elasticsearch cluster?

Accepted Answer

Two or more master nodes simultaneously believing they are the active master

Answer

Split brain occurs when a network partition causes nodes to elect multiple masters, leading to inconsistent cluster states that can corrupt data.

Question 4

What is the `_bulk` API in Elasticsearch primarily used for?

Accepted Answer

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

Answer

The Bulk API allows batching multiple index, create, update, and delete operations into a single API call to reduce network overhead.

Question 5

Which query in Elasticsearch is best suited for searching documents based on an exact keyword value without analysis?

Accepted Answer

term query

Answer

The term query finds documents that contain an exact, unanalyzed value in a field, making it ideal for keyword, numeric, and date fields.

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ElasticSearch ElasticSearch 5