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https://issues.apache.org/jira/browse/LUCENE-4500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481728#comment-13481728
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Robert Muir commented on LUCENE-4500:
-------------------------------------
yeah i think we should add an option to disable this heuristic.
It was basically a perf/relevance thing (in general edits of 2, esp considering
a transposition is a single edit, along wotj minPrefix of 0 can yield
surprisingly irrelevant stuff).
But if someone wants that... let them do it.
> Loosen up DirectSpellChecker's minPrefix requirements
> -----------------------------------------------------
>
> Key: LUCENE-4500
> URL: https://issues.apache.org/jira/browse/LUCENE-4500
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 4.0
> Reporter: Erik Hatcher
> Priority: Minor
>
> DirectSpellChecker currently mandates a minPrefix of 1 when editDistance=2.
> This prohibits a query of "nusglasses" from matching the indexed "sunglasses"
> term.
> Granted, there can be performance issues with using a minPrefix of 0, but
> it's a risk that a user should be allowed to take if needed.
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