Update v_0_3_15.md

Author: david-leifker

docs/managed-datahub/release-notes/v_0_3_15.md

@@ -25,6 +25,12 @@ This contains detailed release notes, but there's also an [announcement blog pos
 
 - OpenAPI Operations Endpoints: Debugging endpoints added for k8 and kafka.
 - Assertion Hook Performance Improvement: Aspects and URNs are now fetched in batches.
+- Elasticsearch 8: Fix role creation
+
+### v0.3.15.4-acryl
+
+- Elasticsearch 7: Fix role creation
+- Elasticsearch/Opensearch: Allow role to inspect nodes for query optimization
 
 ### v0.3.15-acryl