specialpurpose/solr/widget/SolrMenus.xml

<?xml version="1.0" encoding="UTF-8"?>
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<menus xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://ofbiz.apache.org/Widget-Menu" xsi:schemaLocation="http://ofbiz.apache.org/Widget-Menu http://ofbiz.apache.org/dtds/widget-menu.xsd">
    
    <menu name="SolrAppBar" title="${uiLabelMap.SolrApplication}"  extends="CommonAppBarMenu" extends-resource="component://common/widget/CommonMenus.xml">
        <menu-item name="admin" title="${uiLabelMap.SolrAdmin}">
            <link target="/solr" url-mode="plain" target-window="_blank"/>
        </menu-item>
        <menu-item name="main" title="${uiLabelMap.CommonMain}">
            <link target="main"/>
        </menu-item>
        <menu-item name="query" title="${uiLabelMap.CommonQuery}">
            <link target="newquery"/>
        </menu-item>
    </menu>
    
</menus>