Change Typesense action mode to emplace when import documents

This PR changes the action mode to emplace when importing documents to Typesense. This is useful to make sure data will not be overwritten when user have other fields in Typesense that is managed seperately (like externally generated embeddings).

Related documentation:
https://typesense.org/docs/29.0/api/documents.html#action-modes-create-upsert-update-emplace

Author: SoongMingLiang

src/Engines/TypesenseEngine.php

@@ -111,7 +111,7 @@ public function update($models)
      * @throws \Typesense\Exceptions\TypesenseClientError
      * @throws \Http\Client\Exception
      */
-    protected function importDocuments(TypesenseCollection $collectionIndex, array $documents, string $action = 'upsert'): Collection
+    protected function importDocuments(TypesenseCollection $collectionIndex, array $documents, string $action = 'emplace'): Collection
     {
         $importedDocuments = $collectionIndex->getDocuments()->import($documents, ['action' => $action]);
 

tests/Unit/TypesenseEngineTest.php

@@ -133,7 +133,7 @@ public function test_update_method(): void
         $documents->expects($this->once())
             ->method('import')
             ->with(
-                [['id' => 1, 'name' => 'Model 1']], ['action' => 'upsert'],
+                [['id' => 1, 'name' => 'Model 1']], ['action' => 'emplace'],
             )
             ->willReturn([[
                 'success' => true,