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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-11997] $expr cannot use a multikey index</title>
                <link>https://jira.mongodb.org/browse/DOCS-11997</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;----------------------------&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h2&gt;

&lt;p&gt;This came up in a ticket recently - we should document somewhere (preferably in tboth the $expr and multikey index documentation) that this doesn&apos;t work with a multikey index. &lt;br/&gt;
 ----------------------------&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

&lt;p&gt;Add context that $expr doesn&apos;t work with multikey indexes.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Scopeofchanges%28filesthatneedworkandhowmuch%29&quot;&gt;&lt;/a&gt;Scope of changes (files that need work and how much)&lt;/h2&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/query/expr/index.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/operator/query/expr/index.html&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/core/index-multikey/index.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/index-multikey/index.html&lt;/a&gt;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Impacttootherdocsoutsideofthisproduct&quot;&gt;&lt;/a&gt;Impact to other docs outside of this product&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%28workanddate%3F%29&quot;&gt;&lt;/a&gt;MVP (work and date?)&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%28e.g.ScopeDocs%2CInvision%29&quot;&gt;&lt;/a&gt;Resources (e.g. Scope Docs, Invision)&lt;/h2&gt;</description>
                <environment></environment>
        <key id="593855">DOCS-11997</key>
            <summary>$expr cannot use a multikey index</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="isabella.siu@mongodb.com">Isabella Siu</assignee>
                                    <reporter username="nick.brewer">Nick Brewer</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Aug 2018 14:03:09 +0000</created>
                <updated>Mon, 30 Oct 2023 20:55:08 +0000</updated>
                            <resolved>Tue, 4 Sep 2018 19:53:53 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1992872" author="xgen-internal-githook" created="Tue, 4 Sep 2018 18:41:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Isabella Siu&apos;, &apos;email&apos;: &apos;isabellasiu@Isabellas-MacBook.local&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11997&quot; title=&quot;$expr cannot use a multikey index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11997&quot;&gt;&lt;del&gt;DOCS-11997&lt;/del&gt;&lt;/a&gt; Document that $expr cannot use a multikey index&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a3d5b8fbf8697bcd33050919d9977173991d0209&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a3d5b8fbf8697bcd33050919d9977173991d0209&lt;/a&gt;&lt;/p&gt;</comment>
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