Elasticsearch（七）| update(更新)的命令行
update是常用操作，官方地址：https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-update.html
直接通过id更新(_update)
最直接的就是通过id进行更新：
curl --cacert http_ca.crt -u elastic -XPOST https://localhost:9200/test_record/_update/qDK5HIQB8xpN1Xtdcm4P?pretty -H 'Content-Type: application/json' -d '{"script":{"source":"ctx._source.counts--","lang":"painless"}}'上面的命令会把id为qDK5HIQB8xpN1Xtdcm4P，字段为counts的值减1。
如果要同时修改多个id要怎么做呢？直接用{}即可。
https://localhost:9200/test_record/_update/{qDK5HIQB8xpN1Xtdcm4P,qTK5HIQB8xpN1Xtdm245}?pretty如果正确返回下面的结果：
{
"_index" : "test_record",
"_id" : "vdoNN4QBHJgRqN7h6HeV",
"_version" : 3,
"result" : "updated",
"_shards" : {
"total" : 2,
"successful" : 1,
"failed" : 0
},
"_seq_no" : 31,
"_primary_term" : 4
}
{
"_index" : "test_record",
"_id" : "qjK5HIQB8xpN1Xtdy25q",
"_version" : 3,
"result" : "updated",
"_shards" : {
"total" : 2,
"successful" : 1,
"failed" : 0
},
"_seq_no" : 32,
"_primary_term" : 4
}
通过查询id更新(_update_by_query)
上面的id也可以通过查询进行更新操作：
curl --cacert http_ca.crt -u elastic -XPOST https://localhost:9200/test_record/_update_by_query?pretty -H 'Content-Type: application/json' -d '{"query":{"terms":{"_id":["qDK5HIQB8xpN1Xtdcm4P","qTK5HIQB8xpN1Xtdm245"]}},"script":{"source":"ctx._source.counts--","lang":"painless"}}'和上面的效果是一样的，不过从性能上来说上面是发送了2条update命令，更这里只发送了1条update命令。从返回结果也可以看出区别
{
"took" : 240,
"timed_out" : false,
"total" : 2,
"updated" : 2,
"deleted" : 0,
"batches" : 1,
"version_conflicts" : 0,
"noops" : 0,
"retries" : {
"bulk" : 0,
"search" : 0
},
"throttled_millis" : 0,
"requests_per_second" : -1.0,
"throttled_until_millis" : 0,
"failures" : [ ]
}
通过查询关键字更新(_update_by_query)
curl --cacert http_ca.crt -u elastic -XPOST https://localhost:9200/test_record/_update_by_query?pretty -H 'Content-Type: application/json' -d'{"query":{"match":{"key":"中华人民共和国"}},"script":{"source":"ctx._source.counts--","lang":"painless"}}'这条命令是把含关键字为中华人民共和国记录的counts都减1，如果正确就会返回下面的结果
{
"took" : 184,
"timed_out" : false,
"total" : 5,
"updated" : 5,
"deleted" : 0,
"batches" : 1,
"version_conflicts" : 0,
"noops" : 0,
"retries" : {
"bulk" : 0,
"search" : 0
},
"throttled_millis" : 0,
"requests_per_second" : -1.0,
"throttled_until_millis" : 0,
"failures" : [ ]
}
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