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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-13985] 4.4 documentations contradictory on compound + hashed indexes</title>
                <link>https://jira.mongodb.org/browse/DOCS-13985</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/core/index-compound/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/index-compound/&lt;/a&gt;&#160;says:&lt;/p&gt;

&lt;p&gt;&amp;gt;&#160;You may not create compound indexes that have&#160;&lt;tt&gt;hashed&lt;/tt&gt;&#160;index type. You will receive an error if you attempt to create a compound index that includes&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/core/index-hashed/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a hashed index field&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/core/index-hashed/#create-a-compound-hashed-index&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/index-hashed/#create-a-compound-hashed-index&lt;/a&gt;&#160;says&lt;/p&gt;

&lt;p&gt;&amp;gt;&#160;Starting with MongoDB 4.4, MongoDB supports creating compound indexes that include a single hashed field.&lt;/p&gt;

&lt;p&gt;&amp;#8212;&lt;/p&gt;

&lt;p&gt;I think the&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/core/index-compound/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/index-compound/&lt;/a&gt;&#160;page note should be changed to something like:&lt;/p&gt;

&lt;p&gt;&amp;gt; In MongoDB 4.2 and earlier, you could not create compound indexes that have&#160;&lt;tt&gt;hashed&lt;/tt&gt;&#160;index type. From MongoDB 4.4, you can create a compound index with up to one &lt;tt&gt;hashed&lt;/tt&gt; field. See &lt;a href=&quot;https://docs.mongodb.com/manual/core/index-hashed/#create-a-compound-hashed-index&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;compound hashed indexes&lt;/a&gt;.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1542974">DOCS-13985</key>
            <summary>4.4 documentations contradictory on compound + hashed indexes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="joseph.dougherty@mongodb.com">Joseph Dougherty</assignee>
                                    <reporter username="nicholas.cottrell@mongodb.com">Nic Cottrell</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Nov 2020 13:20:04 +0000</created>
                <updated>Mon, 30 Oct 2023 19:31:53 +0000</updated>
                            <resolved>Mon, 4 Jan 2021 19:24:06 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due>Fri, 8 Jan 2021 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3553423" author="ian@10gen.com" created="Thu, 7 Jan 2021 19:27:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;andf-mongodb&apos;, &apos;name&apos;: u&apos;Joseph Dougherty&apos;, &apos;email&apos;: u&apos;joseph.dougherty@mongodb.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13985&quot; title=&quot;4.4 documentations contradictory on compound + hashed indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13985&quot;&gt;&lt;del&gt;DOCS-13985&lt;/del&gt;&lt;/a&gt; clarifies when compound indexes can contain a hashed index field&lt;br/&gt;
Branch:master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a402645c50fd06fd64a5baaf7260cb8d02fcfb54&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a402645c50fd06fd64a5baaf7260cb8d02fcfb54&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3553422" author="ian@10gen.com" created="Thu, 7 Jan 2021 19:27:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;andf-mongodb&apos;, &apos;name&apos;: u&apos;Joseph Dougherty&apos;, &apos;email&apos;: u&apos;joseph.dougherty@mongodb.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13985&quot; title=&quot;4.4 documentations contradictory on compound + hashed indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13985&quot;&gt;&lt;del&gt;DOCS-13985&lt;/del&gt;&lt;/a&gt; clarifies when compound indexes can contain a hashed index field&lt;br/&gt;
Branch:v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/db3d5968e605954045a8cdcdc11f60b4738345e4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/db3d5968e605954045a8cdcdc11f60b4738345e4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3491999" author="asya" created="Mon, 16 Nov 2020 16:47:27 +0000"  >&lt;p&gt;How about if it says instead &lt;/p&gt;

&lt;p&gt;You may not create compound indexes that have more than one hashed field. You will receive an error if you attempt to create a compound index that includes two or more hashed index fields.  Prior to 4.4 no hashed fields were allowed in a compound index.&lt;/p&gt;
</comment>
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