LUCENE-4252: null these out for GC to close ram leak

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1365450 13f79535-47bb-0310-9956-ffa450edef68
6 files changed
tree: 18d90e5359b9433d34675cd7640b90db286d9781
  1. dev-tools/
  2. lucene/
  3. solr/
  4. .gitignore
  5. .hgignore
  6. build.xml
  7. README.txt