RUBY-596 Add specifiable module
RUBY-596 Use specifiable in ensure index
RUBY-596 Use specifiable in drop index
RUBY-596 Use specifiable in read indexes
RUBY-596 Use specifiable in insert
RUBY-596 Use specifiable in create user
RUBY-596 Use specifiable in delete
RUBY-596 Use specifiable in remove user
RUBY-596 Use specifiable in update
RUBY-596 Get deletes from Specifiable
RUBY-596 Get documents from Specifiable
RUBY-596 Get user_name from Specifiable
RUBY-596 Get updates from Specifiable
RUBY-596 Command operation uses Specifiable
RUBY-596 Aggregate operation uses Specifiable
RUBY-596 Kill cursors operation uses Specifiable
RUBY-596 Map/reduce operation uses Specifiable
RUBY-596 get more operation uses Specifiable
RUBY-596 query operation uses Specifiable
RUBY-596 drop index write command uses specifiable