[Solved] Which of the following is a valid reason to use the _reindex API? - Ans: To change the mapping of an existing index by copying data to a new index | Elasticsearch

Elasticsearch - Index Management

Which of the following is a valid reason to use the _reindex API?

ATo upgrade Elasticsearch cluster version

BTo permanently delete all documents in an index

CTo create a snapshot backup of an index

DTo change the mapping of an existing index by copying data to a new index

Step-by-Step Solution

Solution:

Step 1: Identify use cases of _reindex
Reindexing is often used to change mappings or settings by copying data to a new index with updated configurations.
Step 2: Exclude unrelated operations
Deleting documents, upgrading cluster, or snapshot backups are handled by other APIs.
Final Answer:
To change the mapping of an existing index by copying data to a new index -> Option D
Quick Check:
Reindex use case = Change mapping [OK]

Quick Trick: Use reindex to apply new mappings by copying data [OK]

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Which of the following is a valid reason to use the _reindex API?