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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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            <title>[SERVER-59087] add primary key index on _id field in time series collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-59087</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;add primary key index on _id field in time series collection&lt;/p&gt;</description>
                <environment></environment>
        <key id="1840426">SERVER-59087</key>
            <summary>add primary key index on _id field in time series collection</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="michael.gargiulo@mongodb.com">Michael Gargiulo</assignee>
                                    <reporter username="xianzhuo.sky@gmail.com">&#26174;&#21331; &#21016;</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 Aug 2021 01:34:45 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:18 +0000</updated>
                            <resolved>Mon, 23 Aug 2021 16:14:07 +0000</resolved>
                                    <version>5.0.1</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3981641" author="michael.gargiulo" created="Wed, 4 Aug 2021 20:51:19 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xianzhuo.sky%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;xianzhuo.sky@gmail.com&quot;&gt;xianzhuo.sky@gmail.com&lt;/a&gt;&#160;Time series collections behave different from regular collections when it comes to the primary key index. The primary key index of a Time Series collection is an automatically created clustered index on a server generated unique _id value for a group of documents with a unique metaField for a time span. This index and value can be seen in the corresponding system.buckets.foo collection for your Time Series collection, but is more for internal usage, e.g. the TTL index if enabled.&lt;/p&gt;

&lt;p&gt;The _id of the document cannot currently be indexed and cannot be the primary key index for a Time Series collection like a regular collection. That being said, we are currently working on allowing secondary index creation on the _id field for Time Series collections so that you may still create an index on the _id of the document if needed&#160;&lt;/p&gt;</comment>
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