first commit

roblib_alter_solr.info.yml

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+name: Roblib Alter Solr
+type: module
+description: Handles Solr document events.
+core_version_requirement:  ^10
+dependencies:
+  - search_api
+  - search_api_solr

services.yml

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+services:
+  roblib_alter_solr.event_subscriber:
+    class: Drupal\roblib_alter_solr\EventSubscriber\SolrDocumentAlterSubscriber
+    tags:
+      - { name: alterSolrDocument }

src/Event/SolrDocumentAlterSubscriber.php

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+<?php
+
+namespace Drupal\my_module;
+
+use Drupal\search_api\IndexInterface;
+use Drupal\search_api\Item\ItemInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Drupal\search_api_solr\Event\SolrDocumentAlterEvent;
+
+/**
+ * Provides a Solr document alter event subscriber.
+ */
+class SolrDocumentAlterSubscriber implements EventSubscriberInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events[SolrDocumentAlterEvent::class][] = ['alterSolrDocument', 800]; // Priority 800 (adjust as needed)
+    return $events;
+  }
+
+  /**
+   * Alters the Solr document before it is sent to Solr.
+   *
+   * @param \Drupal\search_api_solr\Event\SolrDocumentAlterEvent $event
+   *   The Solr document alter event.
+   */
+  public function alterSolrDocument(SolrDocumentAlterEvent $event) {
+    $solrDocument = $event->getSolrDocument();
+    $item = $event->getItem();
+    $index = $event->getIndex();
+    
+    if ($item->hasField('field_geo_area_name')) {
+      $value = $item->getField('field_geo_area_name')->getValue();
+      $solrDocument->addField('dc.coverage', $value);
+    }
+
+   }
+
+}