https://stackoverflow.com/questions/67992674/finding-maximum-score-among-array-elements-in-elasticsearch-not-a-sum

elastic-search-in-array-explain.json

{
  "took" : 7,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.2038873,
    "hits" : [
      {
        "_shard" : "[arrays][0]",
        "_node" : "xzCt5rJeROWZxFCUWsCGEA",
        "_index" : "arrays",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.2038873,
        "_source" : {
          "name" : [
            "john1",
            "john2"
          ]
        },
        "_explanation" : {
          "value" : 1.2038873,
          "description" : "sum of:",
          "details" : [
            {
              "value" : 0.6019437,
              "description" : "weight(name:john1 in 0) [PerFieldSimilarity], result of:",
              "details" : [
                {
                  "value" : 0.6019437,
                  "description" : "score(freq=1.0), product of:",
                  "details" : [
                    {
                      "value" : 1.6500001,
                      "description" : "boost",
                      "details" : [ ]
                    },
                    {
                      "value" : 0.6931472,
                      "description" : "idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:",
                      "details" : [
                        {
                          "value" : 1,
                          "description" : "n, number of documents containing term",
                          "details" : [ ]
                        },
                        {
                          "value" : 2,
                          "description" : "N, total number of documents with field",
                          "details" : [ ]
                        }
                      ]
                    },
                    {
                      "value" : 0.5263158,
                      "description" : "tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:",
                      "details" : [
                        {
                          "value" : 1.0,
                          "description" : "freq, occurrences of term within document",
                          "details" : [ ]
                        },
                        {
                          "value" : 1.2,
                          "description" : "k1, term saturation parameter",
                          "details" : [ ]
                        },
                        {
                          "value" : 0.75,
                          "description" : "b, length normalization parameter",
                          "details" : [ ]
                        },
                        {
                          "value" : 1.0,
                          "description" : "dl, length of field",
                          "details" : [ ]
                        },
                        {
                          "value" : 1.5,
                          "description" : "avgdl, average length of field",
                          "details" : [ ]
                        }
                      ]
                    }
                  ]
                }
              ]
            },
            {
              "value" : 0.6019437,
              "description" : "weight(name:john2 in 0) [PerFieldSimilarity], result of:",
              "details" : [
                {
                  "value" : 0.6019437,
                  "description" : "score(freq=1.0), product of:",
                  "details" : [
                    {
                      "value" : 1.6500001,
                      "description" : "boost",
                      "details" : [ ]
                    },
                    {
                      "value" : 0.6931472,
                      "description" : "idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:",
                      "details" : [
                        {
                          "value" : 1,
                          "description" : "n, number of documents containing term",
                          "details" : [ ]
                        },
                        {
                          "value" : 2,
                          "description" : "N, total number of documents with field",
                          "details" : [ ]
                        }
                      ]
                    },
                    {
                      "value" : 0.5263158,
                      "description" : "tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:",
                      "details" : [
                        {
                          "value" : 1.0,
                          "description" : "freq, occurrences of term within document",
                          "details" : [ ]
                        },
                        {
                          "value" : 1.2,
                          "description" : "k1, term saturation parameter",
                          "details" : [ ]
                        },
                        {
                          "value" : 0.75,
                          "description" : "b, length normalization parameter",
                          "details" : [ ]
                        },
                        {
                          "value" : 1.0,
                          "description" : "dl, length of field",
                          "details" : [ ]
                        },
                        {
                          "value" : 1.5,
                          "description" : "avgdl, average length of field",
                          "details" : [ ]
                        }
                      ]
                    }
                  ]
                }
              ]
            }
          ]
        }
      }
    ]
  }
}