How elasticsearch calculate the score corresponding to the document

HOW DOES ELASTICSEARCH CALCULATE THE SCORE FOR THE FOLLWING AND WHAT THIS
SCORE MEANS.

hits: [

  • {
    • _shard: 3
    • _node: k8BXmkARRsaaYlUJTRpIqQ
    • _index: phone
    • _type: iphone
    • _id: 2
    • _score: 0.2712221
    • _source: {
      • title: iphone update
      • description: this section shows how to update yopur iphone to
        work smoothly in your iphone

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