Curl indices.memory.index_buffer_size?

Elastic Stack Elasticsearch
1

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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