private static void printUsage() {
        System.out.println("Computes the string segment match metrics of a query and field.");
        System.out.println("Usage: java -jar searchlib.jar query field");
        System.out.println("Author: bratseth");
    }
Helper for computing metrics from the command line.
searchlib/src/main/java/com/yahoo/searchlib/ranking/features/fieldmatch/Main.java