Ok, after messing with this for a long time I figured out that other people can't search for numeric data. Here is a solution:
PHP Code:
$index = Zend_Search_Lucene::open();
$pathTerm = new Zend_Search_Lucene_Index_Term('$numericData', 'fieldname');
$pathQuery = new Zend_Search_Lucene_Search_Query_Term($pathTerm);
$query = new Zend_Search_Lucene_Search_Query_Boolean();
$query->addSubquery($pathQuery, true /* required */);
$hits = $index->find($query);
Note: fieldname can be omitted but obviously if you are looking to delete a Lucene Doc to update it you want to search for the exact field.