How to get the keywords in articles which hitted by search?

[ford2000 <jo...@gmail.com>]

For instance, I use search term "lucene OR java OR keyword" to create a
query, and the result comes back with a bunch of articles, my question is
how I can know which keywords in the resultant articles, also in the search
term "lucene OR java OR keyword", I've used Lucene Explanation class to
extract the information I want, however, "Computing an explanation is as
expensive as executing the query over the entire index", is there any other
way to get those hitting keywords? thanks
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