bug #377 [Examples][Milvus] Fix RAG example (OskarStark)

This PR was merged into the main branch.

Discussion
----------

[Examples][Milvus] Fix RAG example

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Docs?         | no
| Issues        | --
| License       | MIT

Commits
-------

8007935 [Examples][Milvus] Fix RAG example

Author: OskarStark

examples/rag/milvus.php

@@ -38,7 +38,7 @@
 );
 
 // initialize the index
-$store->initialize();
+$store->setup();
 
 // create embeddings and documents
 $documents = [];