AI-102 Plan and manage an Azure AI solution Practice Question
Your company has an existing Azure AI Search index used for e-commerce product search. The index is populated by an indexer that runs every hour. Recently, the product team added a new field 'promotionPrice' that should be searchable. You need to update the index to include this field without reindexing all documents. The field should be of type Edm.Double, searchable, filterable, and sortable. What should you do?
⚠ Common exam trap
Watch out — candidates often assume the indexer can automatically update the index schema when a new field is added to the data source, but Azure AI Search requires explicit schema updates before the indexer can map and populate the new field.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Update the index schema to add the new field using the portal or REST API. Then update the indexer to map the field.
Azure AI Search allows you to add new fields to an existing index schema without reindexing all documents, as long as the new field is nullable or has a default value. After updating the index schema via the portal or REST API, you must update the indexer's field mappings to map the new 'promotionPrice' field from the data source to the index. The indexer will then populate the field for existing documents on its next run, and new documents will include the field automatically.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add the new field to the data source mapping in the indexer. The indexer will automatically update the index schema.
Why it's wrong here
The indexer does not automatically update the schema; you must update the index first.
- ✓
Update the index schema to add the new field using the portal or REST API. Then update the indexer to map the field.
Why this is correct
No downtime; incremental update.
- ✗
Change the indexer schedule to run every 5 minutes to pickup the new field faster.
Why it's wrong here
The indexer cannot add fields automatically; schema must be updated.
- ✗
Delete the index and recreate it with the new field. Then run the indexer to repopulate all documents.
Why it's wrong here
Causes downtime and unnecessary reindexing.
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