[BUG] ML task index mapping is wrong

[ylwu-amzn]

ML task index mapping is wrong, remote_job field part will be ignored.
https://github.com/opensearch-project/ml-commons/blob/main/common/src/main/java/org/opensearch/ml/common/CommonValue.java#L353

{
    "_meta": {"schema_version": 3},
    "properties": {
      "model_id": {"type": "keyword"},
      "task_type": {"type": "keyword"},
      "function_name": {"type": "keyword"},
      "state": {"type": "keyword"},
      "input_type": {"type": "keyword"},
      "progress": {"type": "float"},
      "output_index": {"type": "keyword"},
      "worker_node": {"type": "keyword"},
      "create_time": {"type": "date", "format": "strict_date_time||epoch_millis"},
      "last_update_time": {"type": "date", "format": "strict_date_time||epoch_millis"},
      "error": {"type": "text"},
      "is_async" : {"type" : "boolean"}, 
      "user": {
        "type": "nested",
        "properties": {
          "name": {"type":"text", "fields":{"keyword":{"type":"keyword", "ignore_above":256}}},
          "backend_roles": {"type":"text", "fields":{"keyword":{"type":"keyword"}}},
          "roles": {"type":"text", "fields":{"keyword":{"type":"keyword"}}},
          "custom_attribute_names": {"type":"text", "fields":{"keyword":{"type":"keyword"}}}
        }
      }
    }
},"remote_job" : {"type": "flat_object"}
    }
}

[ylwu-amzn]

Use java code to construct index mapping is error-prone. Let's create index mapping json file like AD https://github.com/opensearch-project/anomaly-detection/tree/main/src/main/resources/mappings

[dhrubo-os]

Use java code to construct index mapping is error-prone. Let's create index mapping json file like AD https://github.com/opensearch-project/anomaly-detection/tree/main/src/main/resources/mappings

+1 on this. Should we create a separate issue on this?

[ylwu-amzn]

#2951