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The Azure Cosmos DB for MongoDB materialization connector in Estuary delivers documents from Estuary collections into MongoDB-compatible collections in Azure Cosmos DB. It supports continuous materialization from real-time or batch pipelines, using standard merge-based updates by default with optional delta updates for applicable workloads.

• Standard merge-based updates by default to keep destination documents synchronized
• Optional delta updates for workloads where changes should be applied incrementally
• Optional hard deletes to remove destination documents when records are deleted upstream
• Automatic **_id** mapping based on the Estuary collection key
• Handles existing **_id** fields safely by materializing them as _flow_id to avoid conflicts
• Configurable destination database and collection for each binding
• Username and password authentication
• MongoDB connection string support, including mongodb+srv:// addresses
• SSH tunneling support for destinations on secure or private networks

By default, deletions are represented as soft deletes using _meta/op. When hard deletes are enabled, records deleted upstream are also removed from the destination collection. The connector supports both standard updates and delta updates, with standard updates used by default.