How to use MultiFieldQueryParser along with boost factor?

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I have indexed documents in Lucene based on three fields: title, address, city. Now I want to build my query say, C A B so that I can retrieve the documents as follows:

C must be present in the title field of the documents and either A or B must be present in either of address and city fields of the matched documents. The documents that have A present in either of those fields should get higher score or higher boost. Here A, B, C may be single terms or phrases.

I am new to Lucene. I do not have any experience of framing such complex queries. In this context I have read the post Boost factor in MultiFieldQueryParser But this post does not answer my question. So if anyone please help me to solve this I will be really grateful.

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lucene
Is what you have in mind something like: +title: C +(address: A B city: A B)^2 where 2 is the boost level? - rae1

2 Answers

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title:C AND (address:A^2 OR city:A^2 OR address:B OR city:B)

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Don't get caught up on reading about MultiFieldQueryParser, that isn't really what you need for this. Standard QueryParser syntax will serve your purposes you fine.

See the Lucene QueryParser syntax documentation

A query like:

+title:C +((address:A city:A)^2 address:B city:B)

Should do nicely.

To explain a bit:

+title:C - require a match on title:C. No results will be returned that don't match this condition.

+(....) - require a match on the subquery contained inside. As long as a match is found on any one of the optional queries contained within the parentheses is matched, this will be satisfied.

(address:A city:A)^2 - You prefer a match on A, these two queries are boosted more heavily with ^2.