Make use of "hasFullText" flag.

languages/en.ini

@@ -411,6 +411,7 @@ Geographic Search = "Geographic Search"
 Geographic Terms = "Geographic Terms"
 Geography = "Geography"
 Get full text = "Get full text"
+Get more information = "Get more information"
 Get RSS Feed = "Get RSS Feed"
 Globe = "Globe"
 Go = "Go"

module/VuFind/src/VuFind/RecordDriver/Summon.php

@@ -499,11 +499,9 @@ class Summon extends DefaultRecord
     public function getURLs()
     {
         if (isset($this->fields['link'])) {
+            $msg = $this->hasFullText() ? 'Get full text' : 'Get more information';
             return [
-                [
-                    'url' => $this->fields['link'],
-                    'desc' => $this->translate('Get full text')
-                ]
+                ['url' => $this->fields['link'], 'desc' => $this->translate($msg)]
             ];
         }
         $retVal = [];
@@ -629,4 +627,14 @@ class Summon extends DefaultRecord
         }
         return $str;
     }
+
+    /**
+     * Does this record have full text access?
+     *
+     * @return bool
+     */
+    public function hasFullText()
+    {
+        return (bool)($this->fields['hasFullText'] ?? false);
+    }
 }