Reinstated and edited list item for metadata_storage_sas_token

Author: RobDixon22

articles/search/search-howto-indexing-azure-blob-storage.md

@@ -141,6 +141,8 @@ Depending on the [indexer configuration](#PartsOfBlobToIndex), the blob indexer
   * **metadata\_storage\_last\_modified** (Edm.DateTimeOffset) - last modified timestamp for the blob. Azure Search uses this timestamp to identify changed blobs, to avoid reindexing everything after the initial indexing.
   * **metadata\_storage\_size** (Edm.Int64) - blob size in bytes.
   * **metadata\_storage\_content\_md5** (Edm.String) - MD5 hash of the blob content, if available.
+  * **metadata\_storage\_sas\_token** (Edm.String) - A temporary [Shared Access Signature (SAS)](https://docs.microsoft.com/azure/storage/common/storage-dotnet-shared-access-signature-part-1) token that can be used by [custom skills](cognitive-search-custom-skill-interface.md) to get access to the blob. This token should not be stored for later use as it might expire.
+
 * Metadata properties specific to each document format are extracted into the fields listed [here](#ContentSpecificMetadata).
 
 You don't need to define fields for all of the above properties in your search index - just capture the properties you need for your application.