Merge remote-tracking branch 'github/0.5.0' into 0.5.0

Former-commit-id: 0f2f646cf87482ae3edc0ad646337d9451f7dc46

CHANGELOG.md

@@ -26,6 +26,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - MS-653 - When config check fail, Milvus close without message
 - MS-654 - Describe index timeout when building index
 - MS-658 - Fix SQ8 Hybrid can't search
+- #9 Change default gpu_cache_capacity to 4
 
 ## Improvement
 - MS-552 - Add and change the easylogging library