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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>[SERVER-85768] Improve error message when $documents stage is used on a collection aggregation</title>
                <link>https://jira.mongodb.org/browse/SERVER-85768</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running the following command on mongo v7.0.5, the error message wasn&apos;t clear for me.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Enterprise test&amp;gt; db.test.aggregate([ { $documents: [{ nb: [1, 2, 3] }] }, { $project: { total: { $sum: [&quot;$nb&quot;] } } }] )&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;MongoServerError: &apos;$documents&apos; can only be run with {aggregate: 1}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;I didn&apos;t know&#160;{aggregate: 1}&#160;was the literal expression of a database or cluster-level aggregation.&lt;/p&gt;

&lt;p&gt;Could you change the error message to make it more explicit:&lt;/p&gt;
&lt;p/&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;MongoServerError: &apos;$documents&apos; can only be run with database or cluster-level aggregation {aggregate: 1}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="2558119">SERVER-85768</key>
            <summary>Improve error message when $documents stage is used on a collection aggregation</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="12452" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Needs Scheduling</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="jerome.tamarelle@mongodb.com">J&#233;r&#244;me Tamarelle</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 Jan 2024 08:25:34 +0000</created>
                <updated>Fri, 2 Feb 2024 19:16:14 +0000</updated>
                                            <version>7.0.5</version>
                                                                        <votes>0</votes>
                                    <watches>2</watches>
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            <issuekey id="2558120">DOCS-16604</issuekey>
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