void doSave() {
        try {
            this.service.getStorage().saveToFile(PersistedSubject.this);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            this.pendingSave = false;
        }
    }
Requests that this subjects data is saved to disk
sponge/src/main/java/me/lucko/luckperms/sponge/service/model/persisted/PersistedSubject.java