Elasticsearch可以動態設定某些屬性，並且可以透過API來進行設定，包括transient和persistent兩種方式，

例如，下面的執行命令：

PUT /_cluster/settings

{

"persistent" : {

"indices.lifecycle.poll_interval":"1s"

},

"transient" : {

"cluster.routing.allocation.disk.watermark.low": "90%",

"cluster.routing.allocation.disk.watermark.high": "95%",

"cluster.info.update.interval": "1m"

}

}

執行輸出結果如圖所示：

同時，在Elasticsearch控制檯，也可以看到相應的輸出資訊， cluster.routing.allocation.disk.watermark 屬性設定發生了更新。

[2021-01-30T12:04:23,399][INFO ][o.e.c.s.ClusterSettings ] [node-1] updating [cluster.routing.allocation.disk.watermark.low] from [85%] to [90%]

[2021-01-30T12:04:23,400][INFO ][o.e.c.s.ClusterSettings ] [node-1] updating [cluster.routing.allocation.disk.watermark.high] from [90%] to [95%]

[2021-01-30T12:04:23,400][INFO ][o.e.c.s.ClusterSettings ] [node-1] updating [cluster.info.update.interval] from [30s] to [1m]

查詢Elasticsearch叢集的設定資訊：

_cluster/settings