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https://issues.apache.org/jira/browse/LUCENE-10317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17460252#comment-17460252
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Claude Lepère commented on LUCENE-10317:
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Thank you for your quick answer.
In "the fox is quick", "fox" position is 1, "is" position is 2 and "quick"
is 3; to match "quick fox", first move of "fox" to place it at position 2
(atop "is"), second move to place it at position 3 (atop "quick") and third
move to place it after "quick" = 3 moves; if "is" is removed, one less move.
Is this way to calculate the minimum needed slop correct?
Next test with more terms: query = " wordD wordB wordA", document = "wordA
wordB wordC wordD", the minimum slop is 5.
How does Lucene arrive at this result?
> In PhraseQuery API, the explanation of getSlop is not inexact but could be
> more clear
> -------------------------------------------------------------------------------------
>
> Key: LUCENE-10317
> URL: https://issues.apache.org/jira/browse/LUCENE-10317
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 5.2.1
> Reporter: Claude Lepère
> Priority: Trivial
>
> The explanation says that searching for "quick fox" will match the document
> "the fox is quick" with a slop of 3.
> That's true if the stop word "is" is not removed by the analyzer at indexing
> but, with the standard stop word list of Lucene which includes "is", a slop
> of 2 is enough.
> As I understand the comment in the PhraseQuery source, switching the order of
> two words requires two moves (the first places the words atop one another)
> and the slop is 2, but, if "is" is not removed, a third "move" is needed to
> add "is" itself and the slop is 3. I am not sure of this explanation. I would
> be happy to have it confirmed ... or not.
> I tested both cases in Lucene 5.2.1 but the text is the same in PhraseQuery
> API 8_0_0.
>
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