"http.max_content_length" setting ignored?

[gmile]

I'm unable to specify the http.max_content_length setting via either of the following:

curl -XPUT localhost:9200/_cluster/settings -d '{ "transient" : { "http.max_content_length" : "400mb" } }'
{"acknowledged":true,"persistent":{},"transient":{}}

curl -XPUT localhost:9200/_cluster/settings -d '{ "persistent" : { "http.max_content_length" : "400mb" } }'
{"acknowledged":true,"persistent":{},"transient":{}}

If changing HTTP settings dynamically is prohibited, can this be documented please?

Update. Just found from logs that it's indeed not dynamically updatable:

[2015-09-06 19:49:54,552][WARN ][action.admin.cluster.settings] [Griffin] ignoring transient setting [http.max_content_length], not dynamically updateable

Please, update the documentation or close the ticket at will.