[Extensions] Replaces ADTransportGetFieldsMappingsAction with SDK indices client call

[joshpalis]

Description

Adds field mapping validation check for validate detector API .

note : Valid detector/model configuration returns an empty response : {}

Validate Single Entity Detector (valid detector)

 curl -X POST "localhost:9200/_extensions/_ad-extension/detectors/_validate" -H "Content-Type:application/json" --data
'{
  "name": "test-detector",
  "description": "Test detector",
  "time_field": "@timestamp",
  "indices": [
    "server_log"
  ],
  "feature_attributes": [
    {
      "feature_name": "test",
      "feature_enabled": true,
      "aggregation_query": {
        "test": {
          "avg": {
            "field": "jvmGcTime"
          }
        }
      }
    }
  ],
  "detection_interval": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  },
  "window_delay": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  }
}'
{}

Validate Single Entity Detector (invalid detector mapping : time field)

 curl -X POST "localhost:9200/_extensions/_ad-extension/detectors/_validate" -H "Content-Type:application/json" --data
'{
  "name": "test-detector",
  "description": "Test detector",
  "time_field": "timestamp",
  "indices": [
    "server_log"
  ],
  "feature_attributes": [
    {
      "feature_name": "test",
      "feature_enabled": true,
      "aggregation_query": {
        "test": {
          "avg": {
            "field": "jvmGcTime"
          }
        }
      }
    }
  ],
  "detection_interval": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  },
  "window_delay": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  }
}'
{
  "detector": {
    "time_field": {
      "message": "Timestamp field: (timestamp) is not found in index mapping"
    }
  }
}

Validate Multi Entity Detector (valid detector)

curl -X POST "localhost:9200/_extensions/_ad-extension/detectors/_validate" -H "Content-Type:application/json" --data
`{
  "name": "test-multi-detector",
  "description": "Test detector",
  "time_field": "@timestamp",
  "indices": [
    "server_log"
  ],
  "feature_attributes": [
    {
      "feature_name": "test",
      "feature_enabled": true,
      "aggregation_query": {
        "test": {
          "avg": {
            "field": "cpuTime"
          }
        }
      }
    }
  ],
  "detection_interval": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  },
  "window_delay": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  },
  "category_field": [
    "process"
  ]
}`
{}

Validate Multi Entity Detector (invalid detector mapping : aggregation query field)

curl -X POST "localhost:9200/_extensions/_ad-extension/detectors/_validate" -H "Content-Type:application/json" --data
`{
  "name": "test-multi-detector",
  "description": "Test detector",
  "time_field": "@timestamp",
  "indices": [
    "server_log"
  ],
  "feature_attributes": [
    {
      "feature_name": "test",
      "feature_enabled": true,
      "aggregation_query": {
        "test": {
          "avg": {
            "field": "wrongField"
          }
        }
      }
    }
  ],
  "detection_interval": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  },
  "window_delay": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  },
  "category_field": [
    "process"
  ]
}`
{
  "detector": {
    "feature_attributes": {
      "message": "Feature has an invalid query returning empty aggregated data: test",
      "sub_issues": {
        "test": "Feature has an invalid query returning empty aggregated data"
      }
    }
  }
}

Validate detector model (detection interval of 10 minutes)

-X POST "localhost:9200/_extensions/_ad-extension/detectors/_validate/model" -H "Content-Type:application/json" --data
`
{
  "name": "test-multi-detector",
  "description": "Test detector",
  "time_field": "@timestamp",
  "indices": [
    "server_log"
  ],
  "feature_attributes": [
    {
      "feature_name": "test",
      "feature_enabled": true,
      "aggregation_query": {
        "test": {
          "avg": {
            "field": "cpuTime"
          }
        }
      }
    }
  ],
  "detection_interval": {
    "period": {
      "interval": 10,
      "unit": "Minutes"
    }
  },
  "window_delay": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  },
  "category_field": [
    "process"
  ]
}`
{
  "model": {
    "detection_interval": {
      "message": "The selected detector interval might collect sparse data. Consider changing interval length to: 6",
      "suggested_value": {
        "period": {
          "interval": 6,
          "unit": "Minutes"
        }
      }
    }
  }
}

Validate detector model (suggested detection interval of 6 minutes)

curl -X POST "localhost:9200/_extensions/_ad-extension/detectors/_validate/model" -H "Content-Type:application/json" --data
'{
  "name": "test-multi-detector",
  "description": "Test detector",
  "time_field": "@timestamp",
  "indices": [
    "server_log"
  ],
  "feature_attributes": [
    {
      "feature_name": "test",
      "feature_enabled": true,
      "aggregation_query": {
        "test": {
          "avg": {
            "field": "cpuTime"
          }
        }
      }
    }
  ],
  "detection_interval": {
    "period": {
      "interval": 6,
      "unit": "Minutes"
    }
  },
  "window_delay": {
    "period": {
      "interval": 1,
      "unit": "Minutes"
    }
  },
  "category_field": [
    "process"
  ]
}'
{}

Issues Resolved

opensearch-project/opensearch-sdk-java#361

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