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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-82051] $out to time-series doesn&apos;t add _id if it&apos;s missing</title>
                <link>https://jira.mongodb.org/browse/SERVER-82051</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Seen on 7.0.2-66-g6c4e1e8&lt;/p&gt;

&lt;p/&gt;
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					&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;db.getSiblingDB(&quot;mydb&quot;).mycoll.find()&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;^^ The above prints a single document with just the `mytimefield` field, no `_id`.&lt;/p&gt;

&lt;p&gt;UPDATE: Apparently the _id on inserts comes from the driver.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2471015">SERVER-82051</key>
            <summary>$out to time-series doesn&apos;t add _id if it&apos;s missing</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="felipe.gasper@mongodb.com">Felipe Gasper</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Oct 2023 19:02:01 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:28 +0000</updated>
                            <resolved>Fri, 13 Oct 2023 16:26:01 +0000</resolved>
                                    <version>7.0.3</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5768735" author="gregory.noma" created="Tue, 10 Oct 2023 19:12:01 +0000"  >&lt;blockquote&gt;
&lt;p&gt;This is inconsistent with `insert`, which adds `_id` if it&apos;s not set on the inserted document.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;At least purely from the server perspective I think this isn&apos;t the case, unless it&apos;s changed since I worked on this. My understanding was that most drivers will add an &lt;tt&gt;&amp;#95;id&lt;/tt&gt; if it&apos;s not provided by the user. But if the driver &lt;em&gt;doesn&apos;t&lt;/em&gt; add it, for time-series inserts we leave it as-is (as opposed to non-time-series inserts where the server &lt;em&gt;will&lt;/em&gt; add an &lt;tt&gt;&amp;#95;id&lt;/tt&gt;).&lt;/p&gt;</comment>
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