fix(oss): text-embedding-004 -> gemini-embedding-001 (#489)

text-embedding-004 has been discontinued

Author: mdrxy

src/oss/javascript/integrations/text_embedding/google_generativeai.mdx

@@ -55,7 +55,7 @@ import { GoogleGenerativeAIEmbeddings } from "@langchain/google-genai";
 import { TaskType } from "@google/generative-ai";
 
 const embeddings = new GoogleGenerativeAIEmbeddings({
-  model: "text-embedding-004", // 768 dimensions
+  model: "gemini-embedding-001", // 768 dimensions
   taskType: TaskType.RETRIEVAL_DOCUMENT,
   title: "Document title",
 });

src/oss/javascript/integrations/text_embedding/google_vertex_ai.mdx

@@ -65,7 +65,7 @@ import { VertexAIEmbeddings } from "@langchain/google-vertexai";
 // import { VertexAIEmbeddings } from "@langchain/google-vertexai-web"
 
 const embeddings = new VertexAIEmbeddings({
-  model: "text-embedding-004",
+  model: "gemini-embedding-001",
   // ...
 });
 ```

src/oss/javascript/integrations/text_embedding/index.mdx

@@ -184,7 +184,7 @@ GOOGLE_APPLICATION_CREDENTIALS=credentials.json
 import { VertexAIEmbeddings } from "@langchain/google-vertexai";
 
 const embeddings = new VertexAIEmbeddings({
-  model: "text-embedding-004"
+  model: "gemini-embedding-001"
 });
 ```
 

src/oss/javascript/integrations/vectorstores/index.mdx

@@ -182,7 +182,7 @@ GOOGLE_APPLICATION_CREDENTIALS=credentials.json
 import { VertexAIEmbeddings } from "@langchain/google-vertexai";
 
 const embeddings = new VertexAIEmbeddings({
-  model: "text-embedding-004"
+  model: "gemini-embedding-001"
 });
 ```
 

src/oss/python/integrations/text_embedding/google_vertex_ai_palm.mdx

@@ -81,7 +81,7 @@ Now we can instantiate our model object and generate embeddings:
 from langchain_google_vertexai import VertexAIEmbeddings
 
 # Initialize the a specific Embeddings Model version
-embeddings = VertexAIEmbeddings(model_name="text-embedding-004")
+embeddings = VertexAIEmbeddings(model_name="gemini-embedding-001")
 ```
 
 ## Indexing and Retrieval

src/snippets/embeddings-tabs-js.mdx

@@ -89,7 +89,7 @@
     import { VertexAIEmbeddings } from "@langchain/google-vertexai";
 
     const embeddings = new VertexAIEmbeddings({
-      model: "text-embedding-004"
+      model: "gemini-embedding-001"
     });
     ```
     </Tab>