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    <title>Magnolia - Issue tracker</title>
    <link>https://jira.magnolia-cms.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-uk</language>    <build-info>
        <version>9.4.2</version>
        <build-number>940002</build-number>
        <build-date>19-01-2023</build-date>
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<item>
            <title>[MGNLRANK-4] [Shaping Ranking] What weighting does Lucene provide</title>
                <link>https://jira.magnolia-cms.com/browse/MGNLRANK-4</link>
                <project id="18282" key="MGNLRANK">Ranker</project>
                    <description>&lt;ul&gt;
	&lt;li&gt;Discover &lt;b&gt;What is weighting from the Lucene index&lt;/b&gt; ?
	&lt;ul&gt;
		&lt;li&gt;Provide a list, for internal documentation to further discuss&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Notes:&lt;/p&gt;

&lt;p&gt;Jackrabbit uses the default lucene algorithm to calculate the score for a &lt;b&gt;jcr:contains&lt;/b&gt; clause. any other query element will usually return a &#160;score of 1000. &lt;br/&gt;
a quick test showed the following for the query:&lt;/p&gt;

&lt;p&gt;//*&lt;span class=&quot;error&quot;&gt;&amp;#91;jcr:contains(.,&amp;#39;apache&amp;#39;)&amp;#93;&lt;/span&gt; order by @jcr:score descending&lt;br/&gt;
jcr:score | text property &lt;br/&gt;
&#160;----------------------------------------------------------------------&#160;&lt;br/&gt;
1000 | &quot;Apache Jackrabbit&quot; &lt;br/&gt;
&#160;848 | &quot;some test jackrabbit apache, apache is great&quot; &lt;br/&gt;
&#160;350 | &quot;this is a text that is much larger than the first one and only contains the word apache once.&quot;&lt;/p&gt;

&lt;p&gt;Another article that is inline with the jcr documentation is:&lt;br/&gt;
&lt;a href=&quot;https://stackoverflow.com/questions/30885219/understanding-apache-lucenes-scoring-algorithm&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://stackoverflow.com/questions/30885219/understanding-apache-lucenes-scoring-algorithm&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Scoring calculation is something really complex. Here, you have to begin with &lt;a href=&quot;http://lucene.apache.org/core/5_2_0/core/org/apache/lucene/search/similarities/TFIDFSimilarity.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the primal equation&lt;/a&gt;:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;score(q,d) = coord(q,d) &#183; queryNorm(q) &#183; &#8721; ( tf(t in d) &#183; idf(t)2 &#183; t.getBoost() &#183; norm(t,d) )&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;To translate this into non-geek: the score depends, between others, on the frequency of the search term and on the boost factor assigned&lt;/p&gt;</description>
                <environment></environment>
        <key id="120429">MGNLRANK-4</key>
            <summary>[Shaping Ranking] What weighting does Lucene provide</summary>
                <type id="3" iconUrl="https://jira.magnolia-cms.com/secure/viewavatar?size=xsmall&amp;avatarId=10898&amp;avatarType=issuetype">Task</type>
                                            <priority id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/priorities/neutral.gif">Neutral</priority>
                        <status id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are not closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Obsolete</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="ldelnevo">Laura Delnevo</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Oct 2022 14:01:05 +0200</created>
                <updated>Wed, 5 Jul 2023 16:55:11 +0200</updated>
                            <resolved>Wed, 5 Jul 2023 16:55:10 +0200</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
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