SonarQube 6.7 LTS to 7.9 LTS DB Migration Status/Issue

I have upgrade the sonarqube from 6.7 LTS to 7.9 LTS but unable to see the DB migration status.I can see only the below message in the sonarqube application weblog.
web[o.s.s.p.d.m.s.MassUpdate] 53 snapshots processed (0 items/sec)

I am not sure still the data is migrating or any other issue? Is there any way get the percentage of the DB migration. I have close to 12,393,514 issues in 6.7.

Please help us how to fix this issue?