如何在lucene中预先计算SpanTermQuery？

Question

在查询时，我几乎总是得到SpanQuery匹配，并且想知道如何预先计算窗口共同出现的统计数据。 ？在查询时执行此操作似乎会减慢搜索时间。

          SpanTermQuery[] span_query = new SpanTermQuery[3]
          span_query[0] = new SpanTermQuery(new Term("text", "united"));
          span_query[1] = new SpanTermQuery(new Term("text", "states"));
          span_query[2] = new SpanTermQuery(new Term("text", "department"));
          // find a match in unordered window and window-span is 12. 
          SpanNearQuery span_near_query = new SpanNearQuery(span_query, 12, false);