elasticsearch副本和分片

1.文档冲突

当我们使用index API更新文档，可以一次性读取

修改索引副本

root@es-node3:~# curl -XPUT http://192.168.1.136:9200/es-syslog-2023.08.26/_settings -H "Content-Type: application/json" -d '{
>   "settings": {
>     "index": {
>       "number_of_shards": 3,
>       "number_of_replicas": 2
>     }
>   }
> }'
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Can't update non dynamic settings [[index.number_of_shards]] for open indices [[es-syslog-2023.08.26/5EEqjFuGTBe6_wdyoBeV7g]]"}],"type":"illegal_argument_exception","reason":"Can't update non dynamic settings [[index.number_of_shards]] for open indices [[es-syslog-2023.08.26/5EEqjFuGTBe6_wdyoBeV7g]]"},"status":400}r

看起来您正在尝试修改一个已经打开的索引的非动态设置index.number_of_shards。在默认情况下，Elasticsearch不允许在索引处于打开状态时修改非动态（不可更改）的设置。
curl -XPOST http://192.168.1.136:9200/es-syslog-2023.08.26/_close

使用以下命令来修改索引的设置：
curl -XPUT http://192.168.1.136:9200/es-syslog-2023.08.26/_settings -H “Content-Type: application/json” -d ‘{
“settings”: {
“index.number_of_shards”: 3
}
}’

重新打开索引。
curl -XPOST http://192.168.1.136:9200/es-syslog-2023.08.26/_open

迁移分片

curl -XPOST -H “Content-Type: application/json” -d ‘{
“commands”: [
{
“move”: {
“index”: “es-syslog-2023.12.03”,
“shard”: 0,
“from_node”: “es-node2”,
“to_node”: “es-node1”
}
}
]
}’ http://localhost:9200/_cluster/reroute