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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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>[DOCS-15990] Unclear when an aggregation pipeline can use indexes</title>
                <link>https://jira.mongodb.org/browse/DOCS-15990</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://www.mongodb.com/docs/manual/core/aggregation-pipeline-optimization/#indexes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/manual/core/aggregation-pipeline-optimization/#indexes&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;In this section, I was expecting to find the list of stages that completely prevent the use of indexes further down the pipeline.&#160;&lt;/p&gt;

&lt;p&gt;For example I was convinced that $project and $unset were preventing any indexes from being used based on the documentation but I was surprised to see that these 2 pipelines can actually both use an index on {name:1}.&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Can we improve the doc to be more precise?&lt;br/&gt;
Thanks!&lt;/p&gt;</description>
                <environment></environment>
        <key id="2298858">DOCS-15990</key>
            <summary>Unclear when an aggregation pipeline can use indexes</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="5">Cannot Reproduce</resolution>
                                        <assignee username="lauren.tran@mongodb.com">Lauren Tran</assignee>
                                    <reporter username="maxime.beugnet@mongodb.com">Maxime Beugnet</reporter>
                        <labels>
                    </labels>
                <created>Mon, 27 Mar 2023 17:22:09 +0000</created>
                <updated>Mon, 6 Nov 2023 16:39:10 +0000</updated>
                            <resolved>Thu, 2 Nov 2023 16:58:15 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231106</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5850010" author="JIRAUSER1264464" created="Thu, 2 Nov 2023 16:58:15 +0000"  >&lt;p&gt;Closing this ticket. There doesn&apos;t appear to be consensus between engineering and technical services about how to move forward with any changes. When consensus is reached, feel free to reopen the ticket with the consensus changes in the description. If you have questions, please reach out to Sarah Olson or me directly. Thanks!&#160;&lt;/p&gt;

&lt;p&gt;cc: &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sarah.olson%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;sarah.olson@mongodb.com&quot;&gt;sarah.olson@mongodb.com&lt;/a&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="5791732" author="asya" created="Thu, 19 Oct 2023 17:39:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=maxime.beugnet%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;maxime.beugnet@mongodb.com&quot;&gt;maxime.beugnet@mongodb.com&lt;/a&gt;&#160; FYU, &lt;a href=&quot;https://www.mongodb.com/docs/manual/core/aggregation-pipeline-optimization/#--project-or--unset-or--addfields-or--set-----match-sequence-optimization&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this page&lt;/a&gt; seems to answer your question...&#160;&lt;/p&gt;</comment>
                            <comment id="5791132" author="JIRAUSER1269489" created="Thu, 19 Oct 2023 14:47:51 +0000"  >&lt;p&gt;Closing this ticket as discussed with the OP and members of the ts-experts-queries channel as the list of stages approach is not aligned with the behavior ndexes and aggregation.&#160;&lt;/p&gt;</comment>
                            <comment id="5305007" author="maxime.beugnet" created="Tue, 28 Mar 2023 04:39:05 +0000"  >&lt;p&gt;I thought I did, based on the documentation. But I noticed this gap so... &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;

&lt;p&gt;Now I&apos;m John Snow... I know nothing...&lt;/p&gt;</comment>
                            <comment id="5303540" author="jeffrey.allen" created="Mon, 27 Mar 2023 17:34:24 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=maxime.beugnet%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;maxime.beugnet@mongodb.com&quot;&gt;maxime.beugnet@mongodb.com&lt;/a&gt;, I agree that this would be useful information to add to the docs. Do you happen to know which stages prevent index usage?&lt;/p&gt;</comment>
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