Vertex AI Agent Builder Query

[ethan_tries]

I'm creating and integrating a chatbot into my React app by creating a conversational agent in vertex AI agent builder. The data store agent's data source is a bucket. I'm using IaC to provision my resources. I came to find that there are no terraform modules for Vertex AI. The ones I could find are related to discovery engine:

1)https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/discovery_engine_ch...
2)https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/discovery_engine_data...  

I've seen the documentation is deprecated now:
https://cloud.google.com/discovery-engine/media/docs 

I'm trying to understand where does the discovery engine come into play here if it does at all so i can you these modules as I couldn't find the vertex AI ones?

https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/dialogflow_cx_agent
Is this the same as conversational agent which I want to use for my app or is this different but i can still go ahead?

I'm just new to this so thank you for reading and helping.