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            <title>[SERVER-82794] Preventing dropping the last shard key index doesn&apos;t consider collection uniqueness</title>
                <link>https://jira.mongodb.org/browse/SERVER-82794</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://www.mongodb.com/docs/v7.0/reference/command/shardCollection/#syntax&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shardCollection takes a unique parameter &lt;/a&gt;that when true requires there is an index supporting that shard key that also guarantees uniqueness for the shard key field. After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6491&quot; title=&quot;Prevent dropping shard key index when alternative index doesn&amp;#39;t exist&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6491&quot;&gt;&lt;del&gt;SERVER-6491&lt;/del&gt;&lt;/a&gt;, we don&apos;t allow dropping the last index supporting the shard key, but we don&apos;t consider if the collection was sharded with unique:true. This lets a unique:true sharded collection be supported by a non-unique index if the unique index supporting it is dropped but there is another non-unique index supporting the shard key fields.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2490736">SERVER-82794</key>
            <summary>Preventing dropping the last shard key index doesn&apos;t consider collection uniqueness</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="pol.pinol@mongodb.com">Pol Pinol</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
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                <created>Fri, 3 Nov 2023 20:36:41 +0000</created>
                <updated>Tue, 6 Feb 2024 14:02:47 +0000</updated>
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