Discussed before, it's more relation db task than lucene.
Simple approach is to get a list of terms from your queries and store relation document - query - terms.
I have around 1.6e10 query-terms in postgreSQL and with proper index select takes around 0.6 ms (clustered vacuumed analyzed), 300 ms after day.
I would like to index the user submitted queries to a given index. As a result of this I want to provide something like: people who searched for test searched also with these queries: +title:test +author:somename. I think the simple approach of just adding the queries as a string in a document, would cause many redundancies, e.g. thousands of docs with test in it. Does anybody have programmed something similar, or is it just not a reasonable idea?
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