MC-35039: Update Elasticsearch dependencies for 2.4.0

Author: fascinosum

app/code/Magento/Elasticsearch7/etc/adminhtml/system.xml

@@ -10,7 +10,7 @@
     <system>
         <section id="catalog">
             <group id="search">
-                <!-- Elasticsearch 7.0+ -->
+                <!-- Elasticsearch 7 -->
                 <field id="elasticsearch7_server_hostname" translate="label" type="text" sortOrder="61"
                        showInDefault="1" showInWebsite="0" showInStore="0">
                     <label>Elasticsearch Server Hostname</label>

app/code/Magento/Elasticsearch7/etc/di.xml

@@ -17,7 +17,7 @@
     <type name="Magento\Search\Model\Adminhtml\System\Config\Source\Engine">
         <arguments>
             <argument name="engines" xsi:type="array">
-                <item sortOrder="30" name="elasticsearch7" xsi:type="string">Elasticsearch 7.0+</item>
+                <item sortOrder="30" name="elasticsearch7" xsi:type="string">Elasticsearch 7</item>
             </argument>
         </arguments>
     </type>