[Doc] Tutorial of ml_Inference processor with Cohere Rerank model seems wrong

[ylwu-amzn]

The ML inference processor looks not correct in https://github.com/opensearch-project/ml-commons/blob/main/docs/tutorials/ml_inference/rerank/ml_Inference_with_Cohere_Rerank_model.md#1-create-reranking-pipeline

        "input_map": {
          "documents": "fact_description",
          "query": "_request.ext.query_context.query_text",
          "top_n": "_request.ext.query_context.top_n"
        },
        "output_map": {
          "relevance_score": "results[*].relevance_score",
          "description": "results[*].document.text"
        },

The input/output map should be array of objects like

        "input_map": [
           {
             "documents": "fact_description",
             "query": "_request.ext.query_context.query_text",
             "top_n": "_request.ext.query_context.top_n"
           }
         ],
        "output_map": [
           {
             "relevance_score": "results[*].relevance_score",
             "description": "results[*].document.text"
           }
        ],

[brianf-aws]

Ill look into this. I wonder what I missed usually I test and then paste but will retry it from the top to figure out if its correct.

[brianf-aws]

Just checked, you are correct it yields this error on creation of the pipeline

{
  "error": {
    "root_cause": [
      {
        "type": "parse_exception",
        "reason": "[input_map] property isn't a list, but of type [java.util.HashMap]",
        "processor_type": "ml_inference",
        "property_name": "input_map"
      }
    ],
    "type": "parse_exception",
    "reason": "[input_map] property isn't a list, but of type [java.util.HashMap]",
    "processor_type": "ml_inference",
    "property_name": "input_map"
  },
  "status": 400
}

Created this PR #3556 to resolve this. Thanks for pointing it out I'm trying to remember how I came up with this tutorial my hunch is that I had used OS-Flow because of how well defined the parameters are

[ylwu-amzn]

Thanks @brianf-aws , suggest redo test to check if any other issues. This is not urgent

[brianf-aws]

Sure, makes sense. I redid the OS setup will do the managed service side eventually