curl indices.memory.index_buffer_size ??

[Chris Berry]

Hello,

I am trying to set indices.memory.index_buffer_size to 30% using curl to my 
running cluster

And I am not able to make it "stick"
I am doing this: 

$  curl -XPUT http://foo:9200/_cluster/settings -d '{ "persistent" : { 
"indices.memory.index_buffer_size" : "30%" }}'
{"acknowledged":true,"persistent":{},"transient":{}

But when I check settings it is not there?

Any idea what I am doing wrong??
It is probably something obvious. But I don't see it...

Thanks,
-- Chris 

$ curl -XGET http://foo:9200/_cluster/settings?pretty=true
{
  "persistent" : {
    "threadpool" : {
      "index" : {
        "type" : "cached"
      }
    }
  },
  "transient" : {
    "cluster" : {
      "routing" : {
        "allocation" : {
          "enable" : "all"
        }
      }
    }
  }
}


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