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<item>
            <title>[COMPASS-7579] Investigate changes in SERVER-77112: shardCollection and createIndex create different indexes on time-series buckets collections </title>
                <link>https://jira.mongodb.org/browse/COMPASS-7579</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77112&quot; title=&quot;shardCollection and createIndex create different indexes on time-series buckets collections &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77112&quot;&gt;&lt;del&gt;SERVER-77112&lt;/del&gt;&lt;/a&gt; changes the index on the buckets collection that is created when using the shardCollection command on a time-series collection with the shard key {timeField: 1}. Previously the index with the key {control.min.time: 1} was created, but this was incorrect. Now we create an index with the key {control.min.time: 1, control.max.time: 1}. Additionally, the name of the index is changed to match the name of the index on unsharded collections. Now the name of the index will be &quot;time_1&quot;. Previously the name was &quot;control.min.time_1&quot;. This change is gated behind the feature flag AuthoritativeShardCollection which is targeted to be enabled in 8.1. Without the feature flag enabled, no changes are expected. I will update these tickets if the feature flag is enabled earlier.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;

&lt;p&gt;If you create a sharded time-series collection using the shardCollection command that has a shardKey {timeField: 1} the resulting index in the buckets collection will have the key { control.min.time: 1.0 }.&lt;/p&gt;

&lt;p&gt;However, calling the createIndex command on a sharded time-series collection with the same key {timeField: 1} results in an index in the buckets collection with the key { control.min.time: 1.0, control.max.time: 1.0 }.&lt;/p&gt;

&lt;p&gt;These two indexes have the same key for the view backing the buckets collection.&lt;/p&gt;

&lt;p&gt;We should investigate if these two commands should produce indexes with the same keys for the buckets collection. Here is a file to reproduce this &lt;span class=&quot;error&quot;&gt;&amp;#91;^SERVER-77112.js&amp;#93;&lt;/span&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2546423">COMPASS-7579</key>
            <summary>Investigate changes in SERVER-77112: shardCollection and createIndex create different indexes on time-series buckets collections </summary>
                <type id="10501" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Investigation</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10049" iconUrl="https://jira.mongodb.org/images/icons/statuses/information.png" description="">Needs Triage</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
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                <created>Tue, 16 Jan 2024 15:31:19 +0000</created>
                <updated>Mon, 22 Jan 2024 22:09:22 +0000</updated>
                                                                                <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="6014231" author="dbeng-pm-bot" created="Tue, 16 Jan 2024 16:14:30 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77112&quot; title=&quot;shardCollection and createIndex create different indexes on time-series buckets collections &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77112&quot;&gt;&lt;del&gt;SERVER-77112&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;br/&gt;
7.3.0-rc0&lt;/p&gt;</comment>
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