Upgrade elastic to 7

build.sh

@@ -63,8 +63,8 @@ fllxIu9XYmiBERQ/qPDlGRlOgVTd9xUfHFkzB52c70E=
 =92oX
 -----END PGP PUBLIC KEY BLOCK-----
 EOF
-(echo "deb https://artifacts.elastic.co/packages/oss-6.x/apt stable main" ;
- echo "deb [arch=amd64] https://packages.elastic.co/curator/5/debian9 stable main") \
+(echo "deb https://artifacts.elastic.co/packages/oss-7.x/apt stable main" ;
+ echo "deb [arch=amd64] https://packages.elastic.co/curator/5/debian stable main") \
     > /etc/apt/sources.list.d/elastic.list
 
 apt-get update