Update Az.ElasticSan.psd1 (#26403)

* Update Az.ElasticSan.psd1

* Update Az.ElasticSan.psd1

Author: Nickcandy

src/ElasticSan/ElasticSan/Az.ElasticSan.psd1

@@ -119,7 +119,7 @@ PrivateData = @{
         ReleaseNotes = '* Supported ''EnforceDataIntegrityCheckForIscsi'' for creating and updating volume groups'
 
         # Prerelease string of this module
-        # Prerelease = ''
+        Prerelease = 'preview'
 
         # Flag to indicate whether the module requires explicit user acceptance for install/update/save
         # RequireLicenseAcceptance = $false