Indexing is aborted if a single file has a failure

Multiverse:core manik [t_cached_annotation_lookups]$ java -jar ~/.m2/repository/org/jboss/jandex/1.0.0.Final/jandex-1.0.0.Final.jar -v -o x.y.idx /Volumes/RAMDisk/Users/manik/Code/infinispan/my_repo/core/5.1.0-SNAPSHOT/classes
java.lang.RuntimeException: Invalid Magic
	at org.jboss.jandex.Indexer.verifyMagic(Indexer.java:389)
	at org.jboss.jandex.Indexer.index(Indexer.java:628)
	at org.jboss.jandex.Main.scanFile(Main.java:139)
	at org.jboss.jandex.Main.scanFile(Main.java:133)
	at org.jboss.jandex.Main.scanFile(Main.java:133)
	at org.jboss.jandex.Main.indexDirectory(Main.java:99)
	at org.jboss.jandex.Main.execute(Main.java:69)
	at org.jboss.jandex.Main.main(Main.java:54)

Usage: jandex [-v] [-m] [-o file-name] <directory> | <jar>
        -or-
       jandex [-d] <index-file-name>
Options:
  -v  verbose output
  -m  modify directory or jar instead of creating an external index file
  -o  name the external index file file-name
  -d  dump the index file index-file-name

The default behavior, with no options specified, is to autogenerate an external index file