Merge #542

542: Changes related to the next Meilisearch release (v1.9.0) r=curquiza a=meili-bot

Related to this issue: meilisearch/integration-guides#301

This PR:
- gathers the changes related to the next Meilisearch release (v1.9.0) so that this package is ready when the official release is out.
- should pass the tests against the [latest pre-release of Meilisearch](https://github.com/meilisearch/meilisearch/releases).
- might eventually contain test failures until the Meilisearch v1.9.0 is out.

⚠️ This PR should NOT be merged until the next release of Meilisearch (v1.9.0) is out.

_This PR is auto-generated for the [pre-release week](https://github.com/meilisearch/integration-guides/blob/main/resources/pre-release-week.md) purpose._


Co-authored-by: meili-bot <74670311+meili-bot@users.noreply.github.com>
Co-authored-by: curquiza <clementine@meilisearch.com>

spec/meilisearch/index/documents_spec.rb

@@ -153,11 +153,11 @@
 
         it 'allows the user to store vectors' do
           enable_vector_store(true)
-          new_doc = { objectId: 123, _vectors: [0.1, 0.2, 0.3] }
+          new_doc = { objectId: 123, _vectors: { default: [0.1, 0.2, 0.3] } }
           client.create_index('vector_test').await
           new_index = client.index('vector_test')
           new_index.add_documents(new_doc).await
-          expect(new_index.document(123)['_vectors']).to include(0.1)
+          expect(new_index.search("123", retrieveVectors: true)['hits'][0]['_vectors']).to include('default')
         end
       end
     end