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https://issues.apache.org/jira/browse/SOLR-7539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15636595#comment-15636595
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ASF subversion and git services commented on SOLR-7539:
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Commit 1c32cc9a49d8e692949f92a8a517300e498e1a55 in lucene-solr's branch
refs/heads/branch_6x from [~dawid.weiss]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=1c32cc9 ]
SOLR-7539: Upgrade the clustering plugin to Carrot2 3.15.0.
> Add a QueryAutofilteringComponent for query introspection using indexed
> metadata
> --------------------------------------------------------------------------------
>
> Key: SOLR-7539
> URL: https://issues.apache.org/jira/browse/SOLR-7539
> Project: Solr
> Issue Type: New Feature
> Reporter: Ted Sullivan
> Priority: Minor
> Fix For: 6.0
>
> Attachments: SOLR-7539.patch, SOLR-7539.patch, SOLR-7539.patch,
> SOLR-7539.patch
>
>
> The Query Autofiltering Component provides a method of inferring user intent
> by matching noun phrases that are typically used for faceted-navigation into
> Solr filter or boost queries (depending on configuration settings) so that
> more precise user queries can be met with more precise results.
> The algorithm uses a "longest contiguous phrase match" strategy which allows
> it to disambiguate queries where single terms are ambiguous but phrases are
> not. It will work when there is structured information in the form of String
> fields that are normally used for faceted navigation. It works across fields
> by building a map of search term to index field using the Lucene FieldCache
> (UninvertingReader). This enables users to create free text, multi-term
> queries that combine attributes across facet fields - as if they had searched
> and then navigated through several facet layers. To address the problem of
> exact-match only semantics of String fields, support for synonyms (including
> multi-term synonyms) and stemming was added.
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