SOLR-5794: dial back the randomized constants so we don't blow up the world when running with -Dnightly=true -Dtests.multiplier=2

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1572775 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5782: The full MapReduceIndexer help text does not display when using --help. Also remove reference to Find tool - we don't have access to it yet.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1572778 13f79535-47bb-0310-9956-ffa450edef68