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From Michael Sokolov <msoko...@gmail.com>
Subject Re: How to ignore certain words based on query specifics
Date Tue, 09 Jul 2019 15:57:47 GMT
I think what you're saying in you're example is that "free*" should
match anything with a term matching that pattern, but not *only*
freedom. In other words, if a document has "freedom from stupidity"
 then it should not match, but if the document has "free freedom from
stupidity" than it should.

Is that correct?

You could apply stopwords, except that it sounds as if this is a
per-user blacklist, and you want them to share the same index?

On Tue, Jul 9, 2019 at 11:29 AM Shifflett, David [USA]
<Shifflett_David@bah.com> wrote:
>
> Sorry for the weird reply path, but I couldn’t find an easy reply method via the list
archive.
>
> Anyway …
>
> The use case is as follows:
> Allow the user to specify queries such as ‘free*’
> and also include similar words to be ignored, such as freedom.
> Another example would be ‘secret*’ and secretary.
>
> I want to keep the ignore words separate so they apply to all queries,
> but then realized the ignore words should only apply to relevant (matching) queries.
>
> I don’t want the users to be required to add ‘and not WORD’ many times to each
of the listed queries.
>
> David Shifflett
>
> From: Diego Ceccarelli
>
> Could you please describe the use case? maybe there is an easier solution
>
>
>
> From: "Shifflett, David [USA]" <Shifflett_David@bah.com>
> Date: Tuesday, July 9, 2019 at 8:02 AM
> To: "java-user@lucene.apache.org" <java-user@lucene.apache.org>
> Subject: How to ignore certain words based on query specifics
>
> Hi all,
> I have a configuration file that lists multiple queries, of all different types,
> and that lists words to be ignored.
>
> Each of these lists is user configured, variable in length and content.
>
> I know that, in general, unless the ignore word is in the query it won’t match,
> but I need to be able to handle wildcard, fuzzy, and Regex, queries which might match.
>
> What I need to be able to do is ignore the words in the ignore list,
> but only when they match terms the query would match.
>
> For example: if the query is ‘free*’ and ‘freedom’ should be ignored,
> I could modify the query to be ‘free*’ and not freedom.
>
> But if ‘liberty’ is also to be ignored, I don’t want to add ‘and not liberty’
to that query
> because that could produce false negatives for documents containing free and liberty.
>
> I think what I need to do is:
> for each query
>   for each ignore word
>     if the query would match the ignore word,
>       add ‘and not ignore word’ to the query
>
> How can I test if a query would match an ignore word without putting the ignore words
into an index
> and searching the index?
> This seems like overkill.
>
> To make matters worse, for a query like A and B and C,
> this won’t match an index of ignore words that contains C, but not A or B.
>
> Thanks in advance, for any suggestions or advice,
> David Shifflett
>

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