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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-85243] Add FCV upgrade/downgrade test for shardCollection creating the updated buckets index on the timeField </title>
                <link>https://jira.mongodb.org/browse/SERVER-85243</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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; changed the index created for the shard key {timeField: 1}. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84180&quot; title=&quot;refineCollectionShardKey does not rewrite the new shard key for time-series collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84180&quot;&gt;SERVER-84180&lt;/a&gt; will update existing indexes from {metaField: 1} to {metaField:1, timeField:1} using the updated index definition, which is {control.min.time: 1. control.max.time:1}. However, we need to ensure that if users use shardCollection and refineCollectionShardKey with this updated definition, they can upgrade/downgrade as usual. This ticket should handle writing that test and adding changes to the FCV upgrade/downgrade process if needed. Some of the scenarios that need to be tested are:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;shardCollection with the new index definition, downgrade the FCV, call refineCollectionShardKey, then upgrade FCV again.&lt;/li&gt;
	&lt;li&gt;shardCollection with downgraded FCV, then upgrade the FCV, confirm that queries work as expected, and then call refineCollectionShardKey.&lt;/li&gt;
	&lt;li&gt;shardCollection with upgraded FCV, downgrade FCV, and ensure queries work as expected.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Currently, &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; is gated by the feature flag AuthoritativeShardCollection belonging to PM-1941. This change should be made before the feature flag is enabled.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2546346">SERVER-85243</key>
            <summary>Add FCV upgrade/downgrade test for shardCollection creating the updated buckets index on the timeField </summary>
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                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10033" iconUrl="https://jira.mongodb.org/images/icons/statuses/information.png" description="Status for tickets that need to be escalated and unblocked on our team.">Blocked</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="gil.alon@mongodb.com">Gil Alon</reporter>
                        <labels>
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                <created>Tue, 16 Jan 2024 14:46:07 +0000</created>
                <updated>Thu, 18 Jan 2024 11:20:28 +0000</updated>
                                                                                                <votes>0</votes>
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