ASU-1839: fix destrict field indexing

public/modules/custom/asu_elastic/src/Plugin/search_api/processor/TidToTermNameProcessor.php

@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\asu_elastic\Plugin\search_api\processor;
+
+use Drupal\search_api\Item\ItemInterface;
+use Drupal\search_api\Processor\ProcessorPluginBase;
+
+/**
+ * Converts taxonomy term IDs to their labels for indexing.
+ *
+ * @SearchApiProcessor(
+ *   id = "tid_to_term_name",
+ *   label = @Translation("Term ID to term name"),
+ *   description = @Translation("Converts taxonomy term IDs to term labels for indexing"),
+ *   stages = {
+ *     "preIndex" = 20,
+ *   }
+ * )
+ */
+class TidToTermNameProcessor extends ProcessorPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function preprocessIndexItems(array $items) {
+    foreach ($items as $item) {
+      $this->processItem($item);
+    }
+  }
+
+  /**
+   * Process a single item to convert term IDs to labels.
+   *
+   * @param \Drupal\search_api\Item\ItemInterface $item
+   *   The item to process.
+   */
+  protected function processItem(ItemInterface $item) {
+    $fields = $item->getFields();
+    $entityTypeManager = \Drupal::entityTypeManager();
+    $termStorage = $entityTypeManager->getStorage('taxonomy_term');
+
+    foreach ($fields as $field) {
+      $fieldId = $field->getFieldIdentifier();
+
+      // Only process project_district field.
+      if ($fieldId !== 'project_district') {
+        continue;
+      }
+
+      $values = $field->getValues();
+      $newValues = [];
+
+      foreach ($values as $value) {
+        // If value is numeric, it's a term ID - convert to name.
+        if (is_numeric($value)) {
+          $term = $termStorage->load($value);
+          if ($term) {
+            $newValues[] = $term->label();
+          }
+          else {
+            $newValues[] = $value;
+          }
+        }
+        else {
+          // Already a string (label), keep as is.
+          $newValues[] = $value;
+        }
+      }
+
+      // Update field with converted values if any changed.
+      if (!empty($newValues) && $newValues !== $values) {
+        $field->setValues($newValues);
+      }
+    }
+  }
+
+}