Adding network config for indexers link

Due to increase in support questions about networking, adding link for network configuration for indexers.

Author: gmndrg

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

@@ -7,7 +7,7 @@ author: mgottein
 ms.author: magottei
 ms.service: cognitive-search
 ms.topic: how-to
-ms.date: 02/15/2022
+ms.date: 02/28/2022
 ---
 
 # Index data from Azure Cosmos DB using the MongoDB API
@@ -281,4 +281,5 @@ api-key: [Search service admin key]
 You can now control how you [run the indexer](search-howto-run-reset-indexers.md), [monitor status](search-howto-monitor-indexers.md), or [schedule indexer execution](search-howto-schedule-indexers.md). The following articles apply to indexers that pull content from Azure Cosmos DB:
 
 + [Set up an indexer connection to a Cosmos DB database using a managed identity](search-howto-managed-identities-cosmos-db.md)
-+ [Index large data sets](search-howto-large-index.md)
++ [Index large data sets](search-howto-large-index.md)
++ [Indexer access to content protected by Azure network security features](search-indexer-securing-resources.md)