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Date: Wed, 12 Mar 2014 18:41:13 +0100
From: Christian Reuschling <christian.reuschling@gmail.com>
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Subject: create a Filter/DocIdSet from a number of documents
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I have a small set of document numbers as a query result collected with some non-scoring collector.

Now, I want to send high-performant successive queries only in this document number scope, as part
of a customized Similarity implementation (modified, dynamic idf on result query scope, known as
TF-ICF)

For this, after reading the user list and further looking around, I decided to try the approach
with a filter, i.e. IndexSearcher.search(Query, Filter, HitCountCollector), whereby the filter
should limit the scope to the initially determined document number list.

I have the hope that this will perform very well, because there is no need for reading information
that doesn't last in memory, as e.g. with a TermFrequenciesVector approach.

So far so good - but I can't find a nice way to create this Filter/DocIdSet easily out of my
simple document number list. I know it sounds trivial - what is it I can't see? :)

Thanks so much!

Christian
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