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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>[SERVER-41628] The dollar ($) prefixed field is not valid for storage</title>
                <link>https://jira.mongodb.org/browse/SERVER-41628</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MongoDB does not allowed to store a key prefixed with dollar symbol.&lt;br/&gt;
Eg. &lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&apos;$push&apos; : {&apos;$in&apos; : [200, 201]}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;Error message is:&#160;&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;MongoError: The dollar ($) prefixed field &apos;$in&apos;&#160; is not valid for storage.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;In my case, this was happened when trying to update a document which is already exist.&lt;/p&gt;</description>
                <environment></environment>
        <key id="796087">SERVER-41628</key>
            <summary>The dollar ($) prefixed field is not valid for storage</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="9">Done</resolution>
                                        <assignee username="daniel.hatcher@mongodb.com">Danny Hatcher</assignee>
                                    <reporter username="andru2222">Muthu Prabu</reporter>
                        <labels>
                    </labels>
                <created>Tue, 11 Jun 2019 05:02:08 +0000</created>
                <updated>Tue, 8 Feb 2022 14:44:55 +0000</updated>
                            <resolved>Tue, 11 Jun 2019 15:35:44 +0000</resolved>
                                    <version>3.4.7</version>
                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4342058" author="jeff.yemin" created="Tue, 8 Feb 2022 14:44:55 +0000"  >&lt;p&gt;Note that now, as per&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/limits/#mongodb-limit-Restrictions-on-Field-Names&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Restrictions on Field Names&lt;/a&gt;:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;The server permits storage of field names that contain dots (.) and dollar signs ($).&lt;/p&gt;&lt;/blockquote&gt;</comment>
                            <comment id="2279667" author="daniel.hatcher" created="Tue, 11 Jun 2019 15:35:09 +0000"  >&lt;p&gt;Per our &lt;a href=&quot;https://docs.mongodb.com/manual/reference/limits/#Restrictions-on-Field-Names&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;documentation on field name restrictions&lt;/a&gt;:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;Top-level field names cannot start with the dollar sign ($) character.&lt;br/&gt;
Otherwise, starting in MongoDB 3.6, the server permits storage of field names that contain dots (i.e. .) and dollar signs (i.e. $).&lt;/p&gt;

&lt;p&gt;The MongoDB Query Language cannot always meaningfully express queries over documents whose field names contain these characters (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30575&quot; title=&quot;Please add escaping convention for dot and dollar signs!&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30575&quot;&gt;SERVER-30575&lt;/a&gt;).&lt;br/&gt;
Until support is added in the query language, the use of $ and . in field names is not recommended and is not supported by the official MongoDB drivers.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Please note, the SERVER project is for bugs and feature suggestions for the MongoDB server. As this ticket does not appear to a bug, I will now close it. If you need further assistance troubleshooting, I encourage you to ask our community by posting on the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or on &lt;a href=&quot;https://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;.&lt;/p&gt;</comment>
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