fix: missing init while retrieving context (langchain-ai#8965)

Author: sinedied

.changeset/curly-spoons-build.md

@@ -0,0 +1,5 @@
+---
+"@langchain/azure-cosmosdb": patch
+---
+
+Fix missing init while retrieving context in AzureCosmsosDBNoSQLChatMessageHistory

libs/langchain-azure-cosmosdb/src/chat_histories/nosql.ts

@@ -231,6 +231,7 @@ export class AzureCosmsosDBNoSQLChatMessageHistory extends BaseListChatMessageHi
   }
 
   async getContext(): Promise<Record<string, unknown>> {
+    await this.initializeContainer();
     const document = await this.container
       .item(this.sessionId, this.userId)
       .read();