You want to increment the views field by 1 for a document, but only if the field exists. Which update script achieves this safely?

hard🚀 Application Q9 of 15

Elasticsearch - Document Operations

You want to increment the views field by 1 for a document, but only if the field exists. Which update script achieves this safely?

APOST /articles/_update/10 { "script": "ctx._source.views += 1" }

BPOST /articles/_update/10 { "script": "ctx._source.views = ctx._source.views + 1" }

CPOST /articles/_update/10 { "doc": { "views": views + 1 } }

DPOST /articles/_update/10 { "script": "if (ctx._source.views != null) { ctx._source.views += 1 }" }

Step-by-Step Solution

Solution:

Step 1: Understand the need for safe increment
Increment only if views exists to avoid errors.
Step 2: Analyze script options
POST /articles/_update/10 { "script": "if (ctx._source.views != null) { ctx._source.views += 1 }" } checks for null before incrementing, preventing errors. POST /articles/_update/10 { "script": "ctx._source.views += 1" } and D do not check existence. POST /articles/_update/10 { "doc": { "views": views + 1 } } uses invalid syntax.
Final Answer:
POST /articles/_update/10 { "script": "if (ctx._source.views != null) { ctx._source.views += 1 }" } -> Option D
Quick Check:
Safe increment requires null check = POST /articles/_update/10 { "script": "if (ctx._source.views != null) { ctx._source.views += 1 }" } [OK]

Quick Trick: Check field exists before incrementing in script [OK]

Common Mistakes:

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