Install cassandra lucene only if cassandra is installed.
Install cassandra lucene only if cassandra is installed.

Also, echo a better progress status

Thib17/biggraphite,Thib17/biggraphite,Thib17/biggraphite,iksaif/biggraphite,iksaif/biggraphite,criteo/biggraphite,criteo/biggraphite,iksaif/biggraphite,iksaif/biggraphite,criteo/biggraphite,Thib17/biggraphite,criteo/biggraphite