I run the FST construction example guided package.html with lucene 4.10, and found a compile error.
javac claimed as below.
"FSTTest" is my test class, just copied from javadoc's example.
I modified scratchInts variable type from IntsRef to IntsRefBuilder, it worked fine. (I checked o.a.l.u.fst.TestFSTs.java TestCase and my modification seems to be correct.)
Util.toIntsRef() method takes IntsRefBuilder as 2nd argument instead of IntsRef since 4.10, so Javadocs also should be fixed.