【发布时间】：2021-11-03 06:35:47
【问题描述】：
我的索引中有数亿个文档。搜索的时候发现search&after比from&size慢很多。用from&size，搜索很快，花了几毫秒返回，但是用search after，花了20秒。我的搜索结果是按时间和key排序的（一个关键字copy of _id) ，为什么？有什么区别？ 搜索命令：
{
"query":{
"bool":{
"filter":[
{
"query_string":{
"query":"*"
}
},
{
"range":{
"__time__":{
"gte":1324958207,
"lte":1724958207
}
}
}
]
}
},
"size":10,
"sort":[
{
"__time__":{
"order":"desc"
}
},
{
"__key__":{
"order":"desc"
}
}
],
"search_after":[
1630594662000,
"6130e666-2-67e9e3-f5-1"
],
"profile":true
}
简介：
{"searches":[
{
"query":[
{
"type":"BoostQuery",
"description":"(ConstantScore(DocValuesFieldExistsQuery [field=__time__]))^0.0",
"time_in_nanos":45722536283,
"breakdown":{
"set_min_competitive_score_count":0,
"match_count":0,
"shallow_advance_count":0,
"set_min_competitive_score":0,
"next_doc":45722241414,
"match":0,
"next_doc_count":410919487,
"score_count":0,
"compute_max_score_count":0,
"compute_max_score":0,
"advance":19517,
"advance_count":39,
"score":0,
"build_scorer_count":78,
"create_weight":14271,
"shallow_advance":0,
"create_weight_count":1,
"build_scorer":261081
},
"children":[
{
"type":"DocValuesFieldExistsQuery",
"description":"DocValuesFieldExistsQuery [field=__time__]",
"time_in_nanos":16571715415,
"breakdown":{
"set_min_competitive_score_count":0,
"match_count":0,
"shallow_advance_count":0,
"set_min_competitive_score":0,
"next_doc":16571493898,
"match":0,
"next_doc_count":410919487,
"score_count":0,
"compute_max_score_count":0,
"compute_max_score":0,
"advance":15074,
"advance_count":39,
"score":0,
"build_scorer_count":78,
"create_weight":517,
"shallow_advance":0,
"create_weight_count":1,
"build_scorer":205926
}
}
]
}
],
"rewrite_time":116538,
"collector":[
{
"name":"PagingFieldCollector",
"reason":"search_top_hits",
"time_in_nanos":30851166561
}
]
}
],
"aggregations":[
]
}
【问题讨论】：
标签： elasticsearch search full-text-search