in geronimo-openapi-impl/src/main/java/org/apache/geronimo/microprofile/openapi/impl/processor/AnnotationProcessor.java [451:459]
private String createOperationId(final AnnotatedMethodElement m, final String httpVerb, final String path) {
String name = operationNamingStrategy.name(new NamingStrategy.Context(m, httpVerb, path));
int idx = 1;
while (!operationId.add(name)) {
name = name + "_" + idx;
idx++;
}
return name;
}