LUCENE-5127: simplify fixedgap

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5127@1507086 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5127: fix indent

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5127@1507087 13f79535-47bb-0310-9956-ffa450edef68