public static String getGraphLocation(final String location) {
        return location.endsWith("/") ? location + Constants.HIDDEN_G : location + "/" + Constants.HIDDEN_G;
    }
@param location not null, not empty UNIX-formatted file system path
@return not empty UNIX-formatted file system path to the graph in the location, still compatible with Windows and {@code File}
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/Constants.java