Changed Java dependency from Depends to Suggest.

Since people are using the Oracle JAVA distribution and not the OpenJDK.
You can suggest it of course. Now the installation will at least continue.

If the init script is called, it will exit with a useful error message, that
no JDK is available via the JAVA_HOME variable.

src/deb/control/control

@@ -2,7 +2,8 @@ Package: elasticsearch
 Version: [[version]]
 Architecture: all
 Maintainer: Nicolas Huray <nicolas.huray@gmail.com>
-Depends: libc6, adduser, java7-runtime-headless | java6-runtime-headless | java7-runtime | java6-runtime
+Depends: libc6, adduser
+Suggest: java7-runtime-headless | java6-runtime-headless | java7-runtime | java6-runtime
 Section: web
 Priority: optional
 Homepage: http://www.elasticsearch.org/