I found my first search on new created IndexReader is slow , but after i made a
search , it will be much faster
i'd like to do such "warn up" in the back end of my application rather then
wait for the user to warm this up because it's a little bit unfriendly design .
I know a warmer would d
nowadays , i've been trying every way to improve the performance of indexing ,
IndexWriter's close operation is really costly , and the Lucene's doc sugguest
to re-use IndexWriter instance , i did it , i kept the indexWriter instance ,
and give it back to every request thread , But there comes
