Merge pull request #41924 from ankitvijay/patch-1

Added docs reference link to `HighWaterChangeDeductionPolicy`

Author: Jak-MS

articles/search/search-howto-index-cosmosdb.md

@@ -293,7 +293,7 @@ The generally available .NET SDK has full parity with the generally available RE
 
 ## Indexing changed documents
 
-The purpose of a data change detection policy is to efficiently identify changed data items. Currently, the only supported policy is the `High Water Mark` policy using the `_ts` (timestamp) property provided by Azure Cosmos DB, which is specified as follows:
+The purpose of a data change detection policy is to efficiently identify changed data items. Currently, the only supported policy is the [`HighWaterMarkChangeDetectionPolicy`](https://docs.microsoft.com/dotnet/api/microsoft.azure.search.models.highwatermarkchangedetectionpolicy) using the `_ts` (timestamp) property provided by Azure Cosmos DB, which is specified as follows:
 
     {
         "@odata.type" : "#Microsoft.Azure.Search.HighWaterMarkChangeDetectionPolicy",