code: @SuppressWarnings("unchecked")
      public QueryBuilder or(final DBObject... ors) {
          List l = (List) _query.get(QueryOperators.OR);
          if (l == null) {
              l = new ArrayList();
              _query.put(QueryOperators.OR, l);
          }
          Collections.addAll(l, ors);
          return this;
      }
docs: Equivalent to an $or operand
  
  @param ors the list of conditions to or together
  @return {@code this}