打开 PIT：
```
POST /products/_pit?keep_alive=1m
```
首次查询（不含 search_after）：
```
POST /_search
{
"pit": { "id": "", "keep_alive": "1m" },
"size": 50,
"sort": [ { "price": "asc" }, { "_shard_doc": "asc" } ],
"query": { "term": { "category": "electronics" } }
}
```
后续查询（携带上一页最后一条的 sort 值）：
```
POST /_search
{
"pit": { "id": "", "keep_alive": "1m" },
"size": 50,
"sort": [ { "price": "asc" }, { "_shard_doc": "asc" } ],
"search_after": [ 123.45, "g1AAAAB..." ],
"query": { "term": { "category": "electronics" } }
}
```
关闭 PIT：
```
DELETE /_pit
{
"pit_id": ""
}
```
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