[Solved] You want to reindex data from products_old to products_new and rename the field price to cost during reindexing. Which script correctly performs this transformation? | Elasticsearch

Elasticsearch - Index Management

You want to reindex data from products_old to products_new and rename the field price to cost during reindexing. Which script correctly performs this transformation?

A{ "source": { "index": "products_old" }, "dest": { "index": "products_new" }, "script": { "source": "ctx._source.cost = ctx._source.remove('price')" } }

B{ "source": { "index": "products_old" }, "dest": { "index": "products_new" }, "script": { "source": "ctx._source.price = ctx._source.cost" } }

C{ "source": { "index": "products_old" }, "dest": { "index": "products_new" }, "script": { "source": "ctx._source.cost = ctx._source.price" } }

D{ "source": { "index": "products_old" }, "dest": { "index": "products_new" }, "script": { "source": "ctx._source.price = ctx._source.remove('cost')" } }

Step-by-Step Solution

Solution:

Step 1: Understand field renaming
To rename a field, assign the old field's value to the new field and remove the old field.
Step 2: Analyze scripts
{ "source": { "index": "products_old" }, "dest": { "index": "products_new" }, "script": { "source": "ctx._source.cost = ctx._source.remove('price')" } } assigns cost from price and removes price, correctly renaming it.
Step 3: Eliminate incorrect options
{ "source": { "index": "products_old" }, "dest": { "index": "products_new" }, "script": { "source": "ctx._source.price = ctx._source.cost" } } copies cost from price incorrectly. { "source": { "index": "products_old" }, "dest": { "index": "products_new" }, "script": { "source": "ctx._source.cost = ctx._source.price" } } copies price to cost but does not remove price. { "source": { "index": "products_old" }, "dest": { "index": "products_new" }, "script": { "source": "ctx._source.price = ctx._source.remove('cost')" } } incorrectly removes cost.
Final Answer:
Option A -> Option A
Quick Check:
Assign new field and remove old field [OK]

Quick Trick: Assign new field and remove old field to rename [OK]

Common Mistakes:

MISTAKES

Not removing the old field after copying
Assigning fields in wrong direction
Removing the wrong field

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More Elasticsearch Quizzes

You want to reindex data from products_old to products_new and rename the field price to cost during reindexing. Which script correctly performs this transformation?

Step 1: Understand field renaming

Step 2: Analyze scripts

Step 3: Eliminate incorrect options

Final Answer:

Quick Check:

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