MS-644 - Search crashed with index-type: flat

Former-commit-id: 771762541d7e9d1d15d4688d5fcc17966476de33

core/CHANGELOG.md

@@ -18,6 +18,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - MS-641 - Segment fault(signal 11) in PickToLoad
 - MS-639 - SQ8H index created failed and server hang
 - MS-647 - [monitor] grafana display average cpu-temp
+- MS-644 - Search crashed with index-type: flat
 
 ## Improvement
 - MS-552 - Add and change the easylogging library