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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-20969] Enforce restriction that $indexStats is the first pipeline stage</title>
                <link>https://jira.mongodb.org/browse/SERVER-20969</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the aggregation framework does not enforce any restrictions on the position of the new $indexStats stage within the aggregation pipeline.  Since there are currently no uses cases for $indexStats being anything but the first stage in the pipeline, it may make sense for the server to report an error if it&apos;s not the first stage.&lt;/p&gt;

&lt;p&gt;This is similar to what is done with $out, which is currently required to be the last stage in the pipeline.&lt;/p&gt;

&lt;p&gt;We can always relax the restriction in the future if new stages are added which make sense to go before $indexStats&lt;/p&gt;</description>
                <environment></environment>
        <key id="234755">SERVER-20969</key>
            <summary>Enforce restriction that $indexStats is the first pipeline stage</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Oct 2015 14:34:15 +0000</created>
                <updated>Wed, 4 Nov 2015 16:16:17 +0000</updated>
                            <resolved>Wed, 28 Oct 2015 19:46:34 +0000</resolved>
                                    <version>3.2.0-rc0</version>
                                    <fixVersion>3.2.0-rc2</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1073281" author="xgen-internal-githook" created="Wed, 28 Oct 2015 19:45:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20969&quot; title=&quot;Enforce restriction that $indexStats is the first pipeline stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20969&quot;&gt;&lt;del&gt;SERVER-20969&lt;/del&gt;&lt;/a&gt; Restrict $indexStats to first pipeline stage&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/97da4befad629f5cff05851c539ae88a4127d8f8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/97da4befad629f5cff05851c539ae88a4127d8f8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1063062" author="charlie.swanson" created="Fri, 16 Oct 2015 17:46:36 +0000"  >&lt;p&gt;Seems reasonable, and easy enough. Scheduling for 3.1 Required. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.wahlin&quot; class=&quot;user-hover&quot; rel=&quot;james.wahlin&quot;&gt;james.wahlin&lt;/a&gt;, if you don&apos;t have time for this in the coming iteration or two, feel free to assign to me.&lt;/p&gt;</comment>
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