elasticsearch: make sure we don't update read_on all the time
elasticsearch: make sure we don't update read_on all the time

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