change guova version to 18.0, compatible with elatsicserach 2.3.2
change guova version to 18.0, compatible with elatsicserach 2.3.2

spacewalkman/incubator-zeppelin,spacewalkman/incubator-zeppelin,spacewalkman/incubator-zeppelin,spacewalkman/incubator-zeppelin,spacewalkman/incubator-zeppelin,spacewalkman/incubator-zeppelin,spacewalkman/incubator-zeppelin