Make hl.fl setting configurable via searches.ini.

config/vufind/searches.ini

@@ -48,6 +48,10 @@ default_noresults_recommend[] = SwitchQuery
 ; appear in fields displayed in search results.
 highlighting = true
 
+; Set this to restrict the list of fields that will be highlighted (the hl.fl
+; Solr parameter); default = '*' for all fields:
+;highlighting_fields = *
+
 ; Set this to true in order to include a text snippet in the search results when
 ; a keyword match is found in a field that is not normally displayed as part of
 ; the listing.  For finer control over which fields are used for snippets, see

module/VuFind/src/VuFind/Search/Factory/AbstractSolrBackendFactory.php

@@ -43,6 +43,8 @@ use VuFindSearch\Backend\Solr\HandlerMap;
 use VuFindSearch\Backend\Solr\Connector;
 use VuFindSearch\Backend\Solr\Backend;
 
+use Zend\Config\Config;
+
 use Zend\ServiceManager\ServiceLocatorInterface;
 use Zend\ServiceManager\FactoryInterface;
 
@@ -161,11 +163,14 @@ abstract class AbstractSolrBackendFactory implements FactoryInterface
     {
         $events = $this->serviceLocator->get('SharedEventManager');
 
+        // Load configurations:
+        $config = $this->config->get('config');
+        $search = $this->config->get($this->searchConfig);
+
         // Highlighting
-        $this->getInjectHighlightingListener($backend)->attach($events);
+        $this->getInjectHighlightingListener($backend, $search)->attach($events);
 
         // Spellcheck
-        $config  = $this->config->get('config');
         if (isset($config->Spelling->enabled) && $config->Spelling->enabled) {
             if (isset($config->Spelling->simple) && $config->Spelling->simple) {
                 $dictionaries = array('basicSpell');
@@ -177,7 +182,6 @@ abstract class AbstractSolrBackendFactory implements FactoryInterface
         }
 
         // Apply field stripping if applicable:
-        $search = $this->config->get($this->searchConfig);
         if (isset($search->StripFields) && isset($search->IndexShards)) {
             $strip = $search->StripFields->toArray();
             foreach ($strip as $k => $v) {
@@ -344,11 +348,15 @@ abstract class AbstractSolrBackendFactory implements FactoryInterface
      * Get a highlighting listener for the backend
      * 
      * @param BackendInterface $backend Search backend
+     * @param Config           $search  Search configuration
      *
      * @return InjectHighlightingListener
      */
-    protected function getInjectHighlightingListener(BackendInterface $backend)
-    {
-        return new InjectHighlightingListener($backend);
+    protected function getInjectHighlightingListener(BackendInterface $backend,
+        Config $search
+    ) {
+        $fl = isset($search->General->highlighting_fields)
+            ? $search->General->highlighting_fields : '*';
+        return new InjectHighlightingListener($backend, $fl);
     }
 }
\ No newline at end of file

module/VuFind/src/VuFind/Search/Solr/InjectHighlightingListener.php

@@ -59,16 +59,25 @@ class InjectHighlightingListener
      */
     protected $active = false;
 
+    /**
+     * Fields to highlight when active.
+     *
+     * @var string
+     */
+    protected $fieldList;
+
     /**
      * Constructor.
      *
-     * @param BackendInterface $backend Backend
+     * @param BackendInterface $backend   Backend
+     * @param string           $fieldList Field(s) to highlight (hl.fl param)
      *
      * @return void
      */
-    public function __construct(BackendInterface $backend)
+    public function __construct(BackendInterface $backend, $fieldList = '*')
     {
         $this->backend = $backend;
+        $this->fieldList = $fieldList;
     }
 
     /**
@@ -102,7 +111,7 @@ class InjectHighlightingListener
                 if (!isset($hl[0]) || $hl[0] != 'false') {
                     $this->active = true;
                     $params->set('hl', 'true');
-                    $params->set('hl.fl', '*');
+                    $params->set('hl.fl', $this->fieldList);
                     $params->set('hl.simple.pre', '{{{{START_HILITE}}}}');
                     $params->set('hl.simple.post', '{{{{END_HILITE}}}}');