SearchAfter 之 score获取

前言

ES的查询经历 from + size、Scroll、SearchAfter等方式,都是为了逐一解决查询带来的性能问题，目前search after的查分方式最优

使用

GET twitter/_search
{
   "size": 10,
   "query": {
       "match" : {
           "title" : "elasticsearch"
       }
   },
   "search_after": [1463538857, "654323"],
   "sort": [
       {"date": "asc"},
       {"_id": "desc"}
   ]
}

在上述的查询中，发现是没有score得分的，但是如何才能返回score分数哪？

获取score

Tips: 按照 _score进行排序即可；

{
  "query": {
    "bool": {
      "filter": [
        {
          "term": {
            "docId": "2019_08_09_d0f4bfd720807a162bc228f1e8b65f7d"
          }
        }
      ],
      "must_not": [],
      "should": [
        {
          "match": {
            "title": "elasticsearch"
          }
        }
      ]
    }
  },
  "from": 0,
  "size": 10,
  "sort": [
    {
      "_score": "asc"
    }
  ],
  "aggs": {},
  "search_after": [
    0
  ]
}

返回结果：

"hits": {
"total": 1,
"max_score": null,
"hits": [
{
"_index": "mf_index_2019-08-09",
"_type": "docs",
"_id": "d0f4bfd720807a162bc228f1e8b65f7d",
"_score": 10.90702,
"_routing": "e37a0b0e72e44eb4b98a1ef58be206cd",
"_source": {
"country": "中国大陆",
"spamTag": "other",
"hyTaskType": "实时任务",
"pubTime": 1565348785000,