in src/main/java/org/apache/nifi/NarMojo.java [1144:1152]
protected File getNarFile(File basedir, String finalName, String classifier) {
if (classifier == null) {
classifier = "";
} else if (classifier.trim().length() > 0 && !classifier.startsWith("-")) {
classifier = "-" + classifier;
}
return new File(basedir, finalName + classifier + ".nar");
}