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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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<item>
            <title>[SERVER-40880] _id index is not displayed as unique</title>
                <link>https://jira.mongodb.org/browse/SERVER-40880</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The automatically generated index on &lt;tt&gt;_id&lt;/tt&gt; is a uniqe index as far as I have read and tried.&lt;br/&gt;
 But if you do &lt;tt&gt;db.collection.getIndexes()&lt;/tt&gt; in the mongo shell, the index does not show &lt;tt&gt;&quot;unique&quot; : true,&lt;/tt&gt; like other unique indexes do.&lt;br/&gt;
 This seems a bit confusing to me.&lt;br/&gt;
 Shouldn&apos;t the &lt;tt&gt;_id&lt;/tt&gt; index be shown as unique, as it actually is a unique index?&lt;/p&gt;</description>
                <environment></environment>
        <key id="747248">SERVER-40880</key>
            <summary>_id index is not displayed as unique</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="vampire">Bj&#246;rn Kautler</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Apr 2019 12:31:27 +0000</created>
                <updated>Mon, 29 Apr 2019 14:14:42 +0000</updated>
                            <resolved>Mon, 29 Apr 2019 14:14:42 +0000</resolved>
                                    <version>4.0.9</version>
                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2227551" author="daniel.hatcher" created="Mon, 29 Apr 2019 14:14:30 +0000"  >&lt;p&gt;Hello Bjorn,&lt;/p&gt;

&lt;p&gt;You are correct; the auto-generated index on &lt;tt&gt;_id&lt;/tt&gt; is a unique index. The fact that the index output does not mention that fact is being tracked in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5335&quot; title=&quot;Creation of _id index should automatically add unique:true to index spec&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5335&quot;&gt;SERVER-5335&lt;/a&gt; so I will close this ticket as a duplicate of that one. But please rest assured that this is solely an issue with the output of &lt;tt&gt;getIndexes&lt;/tt&gt; and the index is actually unique.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;/p&gt;

&lt;p&gt;Danny&lt;/p&gt;</comment>
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