fix: add configuration validation to service provider boot

Added validation to check Elasticsearch configuration when ES mode is
enabled. This catches configuration errors early at boot time rather
than failing silently during runtime operations.

Changes:
- Added validateConfiguration() method to service provider
- Validates ELASTICSEARCH_HOST is set when ES is enabled
- Validates ELASTICSEARCH_INDEX is set when ES is enabled
- Throws InvalidArgumentException with helpful error messages
- Called automatically during boot()

Author: ginkelsoft-development

src/EncryptedSearchServiceProvider.php

@@ -53,6 +53,9 @@ public function register(): void
      */
     public function boot(): void
     {
+        // Validate configuration
+        $this->validateConfiguration();
+
         // Publish configuration
         $this->publishes([
             __DIR__ . '/../config/encrypted-search.php' => config_path('encrypted-search.php'),
@@ -75,4 +78,35 @@ public function boot(): void
         // Listen for all Eloquent model events and route them through the observer
         Event::listen('eloquent.*: *', SearchIndexObserver::class);
     }
+
+    /**
+     * Validate package configuration at boot time.
+     *
+     * @return void
+     *
+     * @throws \InvalidArgumentException if configuration is invalid
+     */
+    protected function validateConfiguration(): void
+    {
+        // Validate Elasticsearch configuration if enabled
+        if (config('encrypted-search.elasticsearch.enabled', false)) {
+            $host = config('encrypted-search.elasticsearch.host');
+
+            if (empty($host)) {
+                throw new \InvalidArgumentException(
+                    'Elasticsearch is enabled but ELASTICSEARCH_HOST is not configured. ' .
+                    'Set it in your .env file or disable Elasticsearch mode.'
+                );
+            }
+
+            $index = config('encrypted-search.elasticsearch.index');
+
+            if (empty($index)) {
+                throw new \InvalidArgumentException(
+                    'Elasticsearch is enabled but ELASTICSEARCH_INDEX is not configured. ' .
+                    'Set it in your .env file.'
+                );
+            }
+        }
+    }
 }