You have configured an Azure AI Search indexer with a Cosmos DB data source as shown in the exhibit. The indexer runs successfully, but you notice that the index is missing some documents that were recently added to Cosmos DB. What is the most likely cause?
If the high water mark is not updated, documents with _ts <= high water mark are skipped.
Why this answer
The query uses '@HighWaterMark' which is a placeholder for the high water mark value used for change tracking. However, the query includes 'WHERE c._ts > @HighWaterMark' which filters out documents with a timestamp less than or equal to the high water mark. If the high water mark is not being updated correctly or if documents have the same timestamp, they might be missed.
Option A is wrong because the change tracking is enabled by the query using _ts. Option B is wrong because the query selects all fields needed. Option C is wrong because the container name is correct.
Option D is wrong because the connection string is valid since the indexer runs successfully.