fix log4 config in default docker image

Author: breskeby

distribution/docker/src/docker/Dockerfile.default

@@ -54,7 +54,7 @@ RUN tar -zxf /tmp/elasticsearch.tar.gz --strip-components=1 && \\
 # Reset permissions on all directories
     find . -type d -exec chmod 0555 {} + && \\
 # keep default elasticsearch log4j config
-    mv config/log4j2.properties config/log4j2.file.properties \\
+    mv config/log4j2.properties config/log4j2.file.properties && \\
 # Reset permissions on all files
     find . -type f -exec chmod 0444 {} + && \\
 # Make CLI tools executable