add schema adoptin section

docs/tutorial/IndexerService.md

@@ -7,6 +7,7 @@
 - [Reindex <a name="reindex"></a>](#reindex)
 - [Copy Index <a name="copy-index"></a>](#copy-index)
 - [Get task status <a name="get-task-status"></a>](#get-task-status)
+- [Schema Service adoption <a name="schema-service-adoption"></a>](#schema-service-adoption)
 
 
 ##Introduction <a name="introduction"></a>
@@ -250,3 +251,11 @@ API will respond with status of task.
 
 [Back to table of contents](#TOC)
 
+##Shema Service adoption <a name="schema-service-adoption"></a>
+
+Indexer service is being migrated to use schemas from the Schema service instead of Storage Service.
+Aure implementation has been extended with an additional call to schema service if a schema is not found on Storage service.
+Later call to the Storage Service will be deprecated and then removed(after the end of the deprecation period).
+
+[Back to table of contents](#TOC)
+