LUCENE-5066: fix TestFieldsReader OOM (test bug)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1495290 13f79535-47bb-0310-9956-ffa450edef68
SOLR-4944 -- Disabling the test until we can fix it

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1495295 13f79535-47bb-0310-9956-ffa450edef68