Kalle and Patrick: many thanks for the suggestions! Caching the IndexSearcher in the ServletContext sounds like a very good idea. However, I have to index a number of databases, each with a different Lucene index. So keeping an IndexSearcher for each may come with a prohibitive memory cost. But as far as I can tell, speed is not a problem; creating a new IndexSearcher for each new search is outweighed by HTTP protocol latency.
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