first commit

roblib_solr_query_alter.info.yml

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+name: 'Roblib Search API Solr Query Alter'
+type: module
+description: 'Implements preQuery event to alter Solr queries for Multisite search.'
+core_version_requirement: '^10'
+package: 'Custom'

roblib_solr_query_alter.services.yml

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+services:
+  Drupal\roblib_solr_query_alter\EventSubscriber\PostConvertedQueryEventSubscriber:
+    tags:
+      - { name: 'event_subscriber' }

src/EventSubscriber/PostConvertedQueryEventSubscriber.php

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+<?php
+
+namespace Drupal\roblib_solr_query_alter\EventSubscriber;
+
+use Drupal\advanced_search\AdvancedSearchQuery;
+use Drupal\search_api_solr\Event\PostConvertedQueryEvent;
+use Drupal\search_api_solr\Event\SearchApiSolrEvents;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Subscribes to PostConvertedQueryEvents.
+ *
+ * @package Drupal\advanced_search\EventSubscriber
+ */
+class PostConvertedQueryEventSubscriber implements EventSubscriberInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events[SearchAPISolrEvents::POST_CONVERT_QUERY][] = ['alterSolariumQuery'];
+
+    return $events;
+
+  }
+
+  /**
+   * Alter the query.
+   */
+  public function alterSolariumQuery(PostConvertedQueryEvent $event) {
+    //$search_api_query = $event->getSearchApiQuery();
+    $solarium_query = $event->getSolariumQuery();
+    $handler = $solarium_query->getHandler();
+    if($handler == 'select') {
+      $solarium_query->getFilterQuery('index_filter')
+        ->setQuery('');
+    }
+  }
+
+}