Fixed Symfony deprecations

Author: pmishev

Command/IndexBuildCommand.php

@@ -86,5 +86,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 )
             );
         }
+
+        return 0;
     }
 }

Command/IndexCreateCommand.php

@@ -69,5 +69,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 )
             );
         }
+
+        return 0;
     }
 }