Added lazy index faq

most customers/applications should use consistent indexing.

Author: kanshiG

articles/cosmos-db/faq.md

@@ -162,6 +162,10 @@ You can bulk-insert documents into Azure Cosmos DB in either of two ways:
 * The data migration tool, as described in [Database migration tool for Azure Cosmos DB](import-data.md).
 * Stored procedures, as described in [Server-side JavaScript programming for Azure Cosmos DB](programming.md).
 
+### I have setup my collection to use lazy indexing, I see that my queries do not return expected results. 
+As explained in the indexing section, lazy indexing can result in this behavior. You should almost always use Consistent indexing for all the applications. 
+
+
 ### Does the SQL API support resource link caching?
 Yes, because Azure Cosmos DB is a RESTful service, resource links are immutable and can be cached. SQL API clients can specify an "If-None-Match" header for reads against any resource-like document or collection and then update their local copies after the server version has changed.