Introduced kafka index queue
Merge remote-tracking branch 'gooru/master'
Merge remote-tracking branch 'gooru/master'
Merge remote-tracking branch 'gooru/master'
Merge remote-tracking branch 'gooru/master'
Fixed cassandra not null allowable issue
Merge remote-tracking branch 'gooru/master'
Merge pull request #610 from parthibane/master

Fixed cassandra not null allowable issue