Merge pull request #4285 from ClickHouse/mongo-connector-caveats

Add a section for mongodb cdc connector caveats

Author: Blargian

docs/integrations/data-ingestion/clickpipes/mongodb/index.md

@@ -92,3 +92,12 @@ You can configure the advanced settings if needed. A brief description of each s
 ## What's next? {#whats-next}
 
 Once you've set up your ClickPipe to replicate data from MongoDB to ClickHouse Cloud, you can focus on how to query and model your data for optimal performance.
+
+## Caveats {#caveats}
+
+Here are a few caveats to note when using this connector:
+
+- We require MongoDB version 5.1.0+.
+- We use MongoDB's native Change Streams API for CDC, which relies on the MongoDB oplog to capture real-time changes. 
+- Documents from MongoDB are replicated into ClickHouse as JSON type by default. This allows for flexible schema management and makes it possible to use the rich set of JSON operators in ClickHouse for querying and analytics. You can learn more about querying JSON data [here](https://clickhouse.com/docs/sql-reference/data-types/newjson).
+- Self-serve PrivateLink configuration is not currently available. If you are on AWS and require PrivateLink, please reach out to db-integrations-support@clickhouse.com or create a support ticket — we will work with you to enable it.