fix: correct collection name for Milvus store to use underscores (lan…

…gchain-ai#793)

* fix: correct collection name for Milvus store

Current name produces an error when using Milvus 2.3.0

"Invalid collection name: goldel-escher-bach.  collection name can only contain numbers, letters and underscores"

* Update milvus.md

docs/docs/modules/indexes/vector_stores/integrations/milvus.md

@@ -49,13 +49,13 @@ const vectorStore = await Milvus.fromTexts(
   [{ id: 2 }, { id: 1 }, { id: 3 }, { id: 4 }, { id: 5 }],
   new OpenAIEmbeddings(),
   {
-    collectionName: "goldel-escher-bach",
+    collectionName: "goldel_escher_bach",
   }
 );
 
 // or alternatively from docs
 const vectorStore = await Milvus.fromDocuments(docs, new OpenAIEmbeddings(), {
-  collectionName: "goldel-escher-bach",
+  collectionName: "goldel_escher_bach",
 });
 
 const response = await vectorStore.similaritySearch("scared", 2);
@@ -70,7 +70,7 @@ import { OpenAIEmbeddings } from "langchain/embeddings/openai";
 const vectorStore = await Milvus.fromExistingCollection(
   new OpenAIEmbeddings(),
   {
-    collectionName: "goldel-escher-bach",
+    collectionName: "goldel_escher_bach",
   }
 );