Hi @Christine Kim thanks for the question. Currently, Azure Cognitive Search does not natively support PostgreSQL as a data source for creating an index and indexer
However there is a workaround which was shared on this Stack Overflow: "You can use an Azure Data Factory pipeline that supports PostgreSQL as source and use a staged storage account, then you can create a Blob indexer or use an Azure Cognitive Search index sink.
In this temporary documentation link you can find how to set the Azure Data Factory pipeline for this integration."
Hope that helps.
Best,
Grace