LUCENE-4956: commit working state

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene4956@1534115 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4956: remove trie

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene4956@1534128 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4956: Fix file not found case, add close on finally

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene4956@1534135 13f79535-47bb-0310-9956-ffa450edef68