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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-41257] Disallow 4.2 expressions within persisted structures in FCV 4.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-41257</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;These could cause issues with downgrade and/or replication in a mixed-version cluster.&lt;/p&gt;</description>
                <environment></environment>
        <key id="773211">SERVER-41257</key>
            <summary>Disallow 4.2 expressions within persisted structures in FCV 4.0</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="13201">Fixed</resolution>
                                        <assignee username="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 May 2019 17:48:26 +0000</created>
                <updated>Sun, 29 Oct 2023 22:20:49 +0000</updated>
                            <resolved>Wed, 22 May 2019 20:32:50 +0000</resolved>
                                                    <fixVersion>4.1.12</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2256984" author="xgen-internal-githook" created="Wed, 22 May 2019 20:31:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41257&quot; title=&quot;Disallow 4.2 expressions within persisted structures in FCV 4.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41257&quot;&gt;&lt;del&gt;SERVER-41257&lt;/del&gt;&lt;/a&gt; Disallow persisting new 4.2 expressions in FCV 4.0&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5594eeb9c42f5a28ebb20c8fcce87a2a1a01f6a5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5594eeb9c42f5a28ebb20c8fcce87a2a1a01f6a5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2254811" author="charlie.swanson" created="Tue, 21 May 2019 18:58:57 +0000"  >&lt;p&gt;After talking &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;david.storch@mongodb.com&quot;&gt;david.storch@mongodb.com&lt;/a&gt; we realized this isn&apos;t really a problem for newly introduced stages since those can only be present in view catalogs, but this is a problem for newly introduced expressions like $regexFind since those can be stored in a collection validator or partial index via $expr.&lt;/p&gt;</comment>
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