LUCENE-5472: IndexWriter.addDocument will now throw an IllegalArgumentException if a Term to be indexed exceeds IndexWriter.MAX_TERM_LENGTH (merge r1574595)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1574637 13f79535-47bb-0310-9956-ffa450edef68