[FEATURE][DocBot] Add RAG Search Pipeline

[dtaivpp]

Is your feature request related to a problem?

We need a RAG Search Pipeline that will be used with our cohere-index.

What solution would you like?

In our cluster_bootstrap.py we need to create a search pipeline that will be used as the default for our cohere-index. This search pipeline will need to be created after our models are initiated and before the cohere-index is created.

We will need to use the new LLM_MODEL_ID from our model state as the model for this. See #62

Here is the reference for creating a RAG search pipeline in OpenSearch: https://opensearch.org/docs/latest/ml-commons-plugin/conversational-search/#setting-up-the-pipeline

[ortegaa32]

Could I be assigned to this issue?

[dtaivpp]

Closed with #98