Manage a data deletion detection policy

2 minutes

If an item is deleted from a container in Azure Cosmos DB for NoSQL, that item may not be deleted from the index in Azure Cognitive Search. To enable tracking of deleted items, you must configure a policy to track when an item is deleted.

Azure Cognitive Search supports, exclusively, the ability to track if an item is deleted using a combination of a field and value in a soft-delete scenario. For example, consider this JSON document that has a property named _isDeleted with a value of true.

{
  "id": "E08E4507-9666-411B-AAC4-519C00596B0A",
  "categoryId": "86F3CBAB-97A7-4D01-BABB-ADEFFFAED6B4",
  "sku": "TI-R092",
  "name": "LL Road Tire",
  "_isDeleted": true
}

Using the soft-delete policy, the softDeleteColumnName for the data source (Azure Cosmos DB for NoSQL) would be configured as _isDeleted. The softDeleteMarkerValue would then be set to true. Using this strategy, Azure Cognitive Search will remove items that have been soft-deleted from the container.

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