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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <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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<item>
            <title>[DOCS-12015] Docs for SERVER-36424: Make sure $out&apos;s uniqueKey is unique when target collection is unsharded</title>
                <link>https://jira.mongodb.org/browse/DOCS-12015</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;div class=&quot;panel&quot; style=&quot;background-color: #cccccc;border-style: dashed;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #cccccc;&quot;&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;See the design or the tests for details - in order to use a uniqueKey other than the default you have to be sure there is a compatible unique index. &apos;compatible&apos; is a bit complicated to define, so I won&apos;t attempt to do it again in this box.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;This is just the unsharded piece of&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36047&quot; title=&quot;(Sharded target collection) Enforce existence of unique index containing fields of $out uniqueKey&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36047&quot;&gt;&lt;del&gt;SERVER-36047&lt;/del&gt;&lt;/a&gt;, which we can split off because it won&apos;t depend on support for $out to a sharded collection in the same way.&lt;/p&gt;

&lt;p&gt;As part of this ticket we should verify that:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;An index exists with some combination of the fields from the uniqueKey. The order of the uniqueKey fields shouldn&apos;t matter here, so if my uniqueKey was {a: 1, b: 1} an index on {b: 1, a: 1} should suffice.&lt;/li&gt;
	&lt;li&gt;That index is unique.&lt;/li&gt;
	&lt;li&gt;That index is not partial.&lt;/li&gt;
	&lt;li&gt;That index is compatible with the operation&apos;s collation.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&#160;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

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&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="599442">DOCS-12015</key>
            <summary>Docs for SERVER-36424: Make sure $out&apos;s uniqueKey is unique when target collection is unsharded</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="-1">Unassigned</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Sep 2018 20:15:28 +0000</created>
                <updated>Mon, 13 Nov 2023 18:32:08 +0000</updated>
                            <resolved>Mon, 1 Oct 2018 16:24:29 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
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            <issuekey id="581569">SERVER-36424</issuekey>
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