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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-44792] returnKey() will not work in mixed-version clusters between 4.2 and 4.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-44792</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a 4.2 mongos receives a returnKey() query, it appends an indexKey meta projection on a field &quot;$$&quot;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/8ff79f256f1e57b32edccae37dc260b342323d26/src/mongo/db/query/query_request.cpp#L577-L585&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/8ff79f256f1e57b32edccae37dc260b342323d26/src/mongo/db/query/query_request.cpp#L577-L585&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;That is:&lt;/p&gt;

&lt;p/&gt;
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&lt;p&gt;&quot;$$&quot; is an illegal field name in 4.4, so mongods version 4.4, so when run in a mixed cluster, these queries will uassert().&lt;/p&gt;</description>
                <environment></environment>
        <key id="1020529">SERVER-44792</key>
            <summary>returnKey() will not work in mixed-version clusters between 4.2 and 4.4</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="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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Fri, 22 Nov 2019 18:09:05 +0000</created>
                <updated>Tue, 6 Dec 2022 02:41:39 +0000</updated>
                            <resolved>Tue, 26 Nov 2019 16:43:39 +0000</resolved>
                                    <version>4.3.1</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2566601" author="craig.homa" created="Tue, 26 Nov 2019 16:43:39 +0000"  >&lt;p&gt;Since applications shouldn&apos;t rely on returnKey() in regular workloads, we don&apos;t see it as a high priority that it functions during a 4.2 to 4.4 upgrade.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ian.boros&quot; class=&quot;user-hover&quot; rel=&quot;ian.boros&quot;&gt;ian.boros&lt;/a&gt; please feel free to chime in if you think otherwise.&lt;/p&gt;</comment>
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