请问查询人与人之间合作度，这种聚合查询怎么写呢？

POST _bulk

{"index":{"_index":"book","_type":"doc","_id":"1"}}

{"book":"book1","author":["tom","lee","lucy"]}

{"index":{"_index":"book","_type":"doc","_id":"2"}}

{"book":"book2","author":["tom","lee"]}

{"index":{"_index":"book","_type":"doc","_id":"3"}}

{"book":"book3","author":["tom","lee","lili"]}

{"index":{"_index":"book","_type":"doc","_id":"4"}}

{"book":"book4","author":["tom","lili"]}

{"index":{"_index":"book","_type":"doc","_id":"5"}}

{"book":"book5","author":["tom","lee"]}





GET book/_search

{

  "size":0,

  "query":{

    "term":{

      "author":"tom"

    }

  },

  "aggs":{

    "co-authors":{

      "terms":{

        "field": "author.keyword",

        "min_doc_count": 2

      }

    }

  }

}

{

    "order": 10,

    "template": "fetch_example*",

    "settings": {

      "index": {

        "number_of_shards": "1"

      }

    },

    "mappings": {

      "type": {

        "_all": {

          "enabled": false

        },

        "properties": {

          "书名":{

            "type":"string",

            "index": "not_analyzed"

          },

          "作者":{

            "type":"string",

            "index": "not_analyzed"

          },

          "authors":{  

            "type":"nested",

            "properties":{  

               "作者":{ "type":"string",

            "index": "not_analyzed"}

               

            }

         }

        }

      }

    },

    "aliases": {}

  }

{

  "size": 0,

  "query": {

    "nested": {

      "path": "authors",

      "query": {

        "term": {

          "authors.作者": {

            "value": "张三"

          }

        }

      }

    }

  },

  "aggs": {

    "1": {

      "nested": {

        "path": "authors"

      },

      "aggs": {

        "2": {

          "terms": {

            "field": "authors.作者",

            "size": 10

          },

          "aggs": {

            "filter": {

              "bucket_selector": {

                "buckets_path": {

                  "the_doc_count": "_count"

                },

                "script": "the_doc_count > 2"

              }

            }

          }

        }

      }

    }

  }

}

{

  "took": 849,

  "timed_out": false,

  "_shards": {

    "total": 1,

    "successful": 1,

    "failed": 0

  },

  "hits": {

    "total": 6,

    "max_score": 0,

    "hits": []

  },

  "aggregations": {

    "1": {

      "2": {

        "doc_count_error_upper_bound": 0,

        "sum_other_doc_count": 0,

        "buckets": [

          {

            "key": "张三",

            "doc_count": 6

          },

          {

            "key": "李四",

            "doc_count": 6

          }

        ]

      },

      "doc_count": 18

    }

  }

}